aperture
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C1 noun /ˈæpərtʃər/

aperture

Meaning
an opening, hole, or gap, especially one that lets in light
Example
Light entered through the small aperture in the wall.
C1 verb /əˈbɔːrt/

abort

Meaning
to stop a process or action before it is completed; to end a pregnancy deliberately
Example
The pilot decided to abort the mission due to bad weather.
C1 adjective /ɔːˈstɪə/

austere

Meaning
Severe or strict in manner, attitude, or appearance; plain and simple.
Example
The monk lived an austere life in the mountains.
C1 noun /ˈæbsɛs/

abscess

Meaning
A swollen area within body tissue containing pus, usually caused by infection.
Example
The dentist treated the abscess in his tooth.
C1 noun /əˈkɔːrdiən/

accordion

Meaning
a musical instrument played by squeezing and expanding with keys and buttons
Example
The musician played a cheerful tune on the accordion.
C1 noun /ˌænəsˈθetɪk/

anesthetic

Meaning
A substance that causes loss of sensation or consciousness, especially used during surgery.
Example
The doctor administered a local anesthetic before stitching the wound.
C1 verb /əˈseɪl/

assail

Meaning
to attack violently, either physically or with words
Example
The politician was assailed with difficult questions.
C1 noun əˌkred.ɪˈteɪ.ʃən

accreditation

Meaning
The action or process of officially recognizing someone or something as having a particular status or being qualified to perform a particular activity.
Example
Accreditation ensures institutional credibility.
C1 adverb /əˈkjuːtli/

acutely

Meaning
in a sharp, intense, or severe way; with keen awareness
Example
She was acutely aware of the risks involved.
C1 adjective /əˈpriː.ʃə.bəl/

Appreciable

Meaning
noticeable; significant; considerable in amount
Example
There was an appreciable improvement in his test scores.
C1 adjective /ɔːˈdeɪ.ʃəs/

Audacious

Meaning
showing willingness to take bold risks; daring
Example
His audacious plan to climb the mountain without proper equipment shocked everyone.
C1 adjective /ˌɔːtəˈkrætɪk/

autocratic

Meaning
Relating to a ruler who has absolute power and does not consult others.
Example
The manager’s autocratic style discouraged employees from sharing their ideas.
C1 noun æmˈbɪvələns

ambivalence

Meaning
Having mixed feelings or contradictory ideas about something; uncertainty or confusion.
Example
She felt ambivalence about taking the job offer.
C1 noun ˈæŋkərɪdʒ

anchorage

Meaning
A secure holding place; a place where ships can anchor safely.
Example
The boat was anchored near the shore for safety.
C1 verb /əˈtɛst/

attest

Meaning
To provide or serve as clear evidence of; to confirm or certify the truth of something.
Example
The witness attested to the accuracy of the report.
C1 noun əˈpreɪ.zəl

appraisal

Meaning
An assessment or evaluation of performance or quality.
Example
The annual appraisal determines salary increments.
C1 verb /əbˈsteɪn/

abstain

Meaning
To restrain oneself from indulging in or partaking of something.
Example
People often abstain from digital devices to enhance focus.
C1 noun /ˈæpəθi/

apathy

Meaning
a lack of interest, enthusiasm, or concern
Example
The students showed apathy towards the new rules.
C1 noun ɔːˈstɛr.ɪ.ti

austerity

Meaning
Simple and disciplined lifestyle, avoiding luxury.
Example
The government implemented austerity measures to reduce expenses.
C1 adjective /əˈɡæst/

aghast

Meaning
filled with shock or horror
Example
The audience was aghast at the tragic scene.
C1 noun /əˈflɪkʃən/

affliction

Meaning
a state of pain, suffering, or distress
Example
Poverty is a common affliction in many parts of the world.
C1 verb /əkˈsɛntʃueɪt/

accentuate

Meaning
to emphasize or make something more noticeable
Example
The lighting accentuated the beauty of the painting.
C1 adverb /ˈæmpli/

amply

Meaning
more than sufficiently; generously
Example
She was amply rewarded for her hard work.
C1 noun /ədˈmɪtəns/

admittance

Meaning
the process or fact of entering or being allowed to enter a place
Example
No admittance without a valid ticket.
C1 adjective /ˈædʒɪteɪtɪd/

Agitated

Meaning
disturbed; anxious; restless; excited in a negative way
Example
He became agitated when he heard the bad news.
C1 noun /əˈduː/

ado

Meaning
a fuss or unnecessary activity; trouble or difficulty
Example
Without further ado, let’s begin the ceremony.
C1 noun /ˌæntɪˈsiːdənts/

antecedents

Meaning
previous events, conditions, or people that influence or serve as a basis for something that follows
Example
The lawyer examined the criminal antecedents of the suspect.
C1 noun ænˈtɪk.wə.ti

antiquity

Meaning
The ancient past, especially the period of classical and other human civilizations before the Middle Ages.
Example
The ruins are a reminder of the city's antiquity.
C1 adjective, noun /ɔːɡˈzɪliəri/

auxiliary

Meaning
(adjective) providing supplementary or additional help and support; (noun) a person or thing that provides auxiliary support
Example
The hospital has an auxiliary power generator in case of emergencies.
C1 noun ˈæ.sɛt ˌæl.əˈkeɪ.ʃən

asset allocation

Meaning
An investment strategy that aims to balance risk and reward by apportioning a portfolio's assets according to an individual's goals, risk tolerance, and investment horizon.
Example
Proper asset allocation is key to financial growth.
C1 noun /əˈnɒməli/

anomaly

Meaning
something that deviates from the norm or expected result
Example
The sudden drop in temperature was considered an anomaly.
C1 noun /əˈbreɪʒən/

abrasion

Meaning
a scrape or wearing away of the skin or surface due to friction
Example
He suffered a minor abrasion on his knee after falling.
C1 noun /ˌæktʃuˈæləti/

actuality

Meaning
The state of existing in reality rather than in appearance or imagination.
Example
The movie was based on historical actuality.
C1 noun /æmˈniːʒə/

amnesia

Meaning
A partial or total loss of memory, usually caused by injury, illness, or psychological trauma.
Example
After the accident, she suffered from amnesia and could not remember her own name.
C1 adjective ˌæd.vɚˈser.i.əl

adversarial

Meaning
Involving or characterized by conflict or opposition.
Example
The two companies have an adversarial relationship in the market.
C1 noun /ˈæntlɚ/

antler

Meaning
The branched horns on the head of a deer or similar animal, usually shed and regrown annually.
Example
The deer’s antlers grew larger each year.
C1 noun /ˌænθrəˈpɒlədʒɪst/

anthropologist

Meaning
a person who studies human societies, cultures, and their development
Example
The anthropologist spent years studying the tribal community.
C1 adverb /əˈbrɛst/

abreast

Meaning
side by side and facing the same direction; informed about something
Example
The soldiers marched two abreast down the street.
C1 verb /ɔːɡˈmɛnt/

augment

Meaning
To increase or strengthen something.
Example
The company plans to augment its workforce.
C1 adjective /æmˈfɪb.i.əs/

Amphibious

Meaning
able to live both on land and in water; suitable for both land and water operations
Example
The amphibious vehicle can travel on both land and water.
C1 noun /ˈɑːr.sən.əl/

arsenal

Meaning
A collection or storage place for weapons and military equipment.
Example
The army kept its weapons in a secure arsenal.
C1 noun əˈrɪd.ɪ.ti

aridity

Meaning
The state of being extremely dry, especially having insufficient rainfall to support vegetation.
Example
The aridity of the land is increasing due to climate change.
C1 verb /ˈæk.lɪ.meɪt/

acclimate

Meaning
To adapt or become accustomed to a new environment or situation
Example
It takes time to acclimate to a new climate.
C1 verb /əˈvɛndʒ/

avenge

Meaning
to inflict harm in return for an injury or wrong done to oneself or another
Example
He vowed to avenge his brother's death.
C1 verb /əˈpɔːl/

appall

Meaning
To shock or horrify someone with something unpleasant or bad.
Example
The cruelty of the crime appalled the entire community.
C1 noun /ˈækəleɪd/

accolade

Meaning
An award, honor, or expression of praise.
Example
She received an accolade for her outstanding performance.
C1 noun /ˈænərkɪst/

anarchist

Meaning
a person who believes in or promotes the absence of government or authority
Example
The anarchist group protested against state control.
C1 verb /əˈtoʊn/

atone

Meaning
to make amends for a wrong or injury; to make reparation
Example
He tried to atone for his mistakes by helping others.
C1 adjective /ˌeɪˈtɪpɪkəl/

atypical

Meaning
not representative of a type, group, or class; unusual or abnormal
Example
The doctor said it was an atypical case of the disease.
C1 noun/verb /ˈætrəfi/

atrophy

Meaning
a decrease in size or wasting away of a body part, tissue, or ability due to lack of use
Example
Without regular exercise, muscles may atrophy over time.
C1 noun ˈæltruɪzəm

altruism

Meaning
The belief in or practice of disinterested and selfless concern for the well-being of others.
Example
His altruism motivated others to volunteer.
C1 noun /æbˈstrækʃən/

abstraction

Meaning
the process of forming general ideas by removing specific details; an abstract concept or idea
Example
Abstraction allows complex ideas to be represented in a simplified form.
C1 noun /ˈæmnəsti/

amnesty

Meaning
An official pardon granted to people who have been convicted of political offenses.
Example
The government announced an amnesty for all political prisoners.
C1 noun /ˈeɪ.kər.ɪdʒ/

acreage

Meaning
An area of land measured in acres.
Example
The farmer owns a large acreage of fertile land.
C1 noun /əˈtaɪər/

attire

Meaning
Clothing, especially formal or elegant wear.
Example
She wore traditional attire at the wedding ceremony.
C1 noun /ˈɔːnɪŋ/

awning

Meaning
a sheet of canvas or material stretched on a frame to shelter a place from the sun or rain
Example
We sat under the awning to avoid the heavy rain.
C1 adjective /ˌæntiˈsleɪvəri/

antislavery

Meaning
Opposed to the practice or system of slavery.
Example
The antislavery movement gained momentum in the 19th century.
C1 noun /ænˈθɒlədʒi/

anthology

Meaning
A collection of literary works, such as poems, short stories, or essays, compiled into one volume.
Example
She contributed a poem to the new poetry anthology.
C1 noun /ˈeɪ.nəs/

Anus

Meaning
the opening at the end of the digestive tract through which waste leaves the body
Example
The doctor examined the patient's anus during the medical checkup.
C1 adjective /ˈɔːdəˌtɔːri/

auditory

Meaning
Relating to the sense of hearing.
Example
The lecture was designed to enhance students' auditory learning skills.
C1 noun /ˈæftərˌθɔːt/

afterthought

Meaning
Something added or considered later than originally planned.
Example
The gift seemed like an afterthought rather than a genuine gesture.
C1 noun /ˌæɡ.rəˈveɪ.ʃən/

aggravation

Meaning
The act of making a situation worse or the state of being worsened.
Example
The delay caused great aggravation for the passengers.
C1 adjective /əˌpɒk.əˈlɪp.tɪk/

apocalyptic

Meaning
Describing the end of the world, or something catastrophic and disastrous.
Example
The movie depicts an apocalyptic future after a nuclear war.
C1 noun /ɔːˈtɒmətən/

automaton

Meaning
A machine that works automatically; also refers to a person who behaves like a machine, without thinking.
Example
He worked like an automaton, without showing any emotion.
C1 noun /əˈstuːt.nəs/

astuteness

Meaning
The ability to accurately assess situations or people and turn this to one's advantage.
Example
His astuteness helped in negotiations.
C1 verb /ɔːˈθɛntɪkeɪt/

authenticate

Meaning
To prove or show that something is genuine or true.
Example
The bank uses advanced technology to authenticate online transactions.
C1 noun, verb /ˈɔːtɒpsi/

autopsy

Meaning
a post-mortem examination to discover the cause of death or the extent of disease
Example
The autopsy revealed that the victim had died from poisoning.
C1 noun /əˈlɒt.mənt/

allotment

Meaning
The distribution or allocation of something, especially resources or portions.
Example
Each department received an allotment of resources.
C1 noun /əˈsɛsər/

assessor

Meaning
a person who evaluates or estimates the nature, ability, or quality of something
Example
An external assessor reviewed the project report.
C1 adjective, noun /əbˈzɔːrbənt/

absorbent

Meaning
able to soak up liquid, moisture, or energy easily; a material or substance that absorbs
Example
This towel is highly absorbent and dries quickly.
C1 adjective /əˈtrəʊ.ʃəs/

Atrocious

Meaning
horrifyingly wicked; extremely bad or unpleasant
Example
The conditions in the prison were atrocious.
C1 adjective /ədˈmɪsəbl/

admissible

Meaning
acceptable or valid, especially as evidence in a court of law
Example
The judge ruled that the document was admissible as evidence.
C1 noun /əˈsɛnʃən/

ascension

Meaning
The act of rising or going up, often to an important position or a higher place.
Example
His rapid ascension in the company surprised everyone.
C1 verb /eɪl/

ail

Meaning
to be ill or suffer from a physical or mental problem; to trouble or afflict
Example
She has been ailing since last winter.
C1 noun /əˌlɪtəˈreɪʃən/

alliteration

Meaning
the occurrence of the same consonant sound at the beginning of words in close succession
Example
She used alliteration in her poem to add musicality.
C1 noun /ˈɑː.kɪ.taɪp/

archetype

Meaning
A very typical example of a certain person or thing; an original model or prototype.
Example
This painting is the archetype of modern art.
C1 adjective eɪˈsɪŋ.krə.nəs

asynchronous

Meaning
Of or requiring a form of computer control timing protocol in which a specific operation begins upon receipt of an indication that the preceding operation has been completed.
Example
Asynchronous courses allow students to learn at their own pace.
C1 noun ˌæmbɪˈɡjuːɪti

ambiguity

Meaning
The quality of being open to more than one interpretation; inexactness.
Example
The ambiguity of the statement caused confusion among the team.
C1 adjective /ˈæm.ɪ.kə.bəl/

amicable

Meaning
Having a spirit of friendliness; without serious disagreement or rancor.
Example
They reached an amicable agreement.
C1 noun ˌæprɪˈhɛnʃən

apprehension

Meaning
Anxiety or fear that something bad or unpleasant will happen.
Example
There is an apprehension about the depletion of fish stocks.
C1 noun ˌæɡ.rəʊˈkem.ɪ.kəl

agrochemical

Meaning
A chemical product used in agriculture, especially a pesticide or fertilizer.
Example
Excessive use of agrochemicals can degrade soil quality.
C1 verb /əˈkrɛdɪt/

accredit

Meaning
to officially recognize, authorize, or approve someone or something
Example
The university is accredited by the national education board.
C1 noun /ˈæŋɡwɪʃ/

anguish

Meaning
Severe mental or physical pain or suffering.
Example
She was in deep anguish after hearing the tragic news.
C1 adjective /ˈɑːr.dənt/

Ardent

Meaning
very enthusiastic; passionate; fervent
Example
She is an ardent supporter of environmental conservation.
C1 noun /ˈævətɑːr/

avatar

Meaning
an icon or figure representing a person in digital contexts; in Hinduism, a divine incarnation
Example
She changed her social media avatar to a new cartoon image.
C1 verb /əˈluːd/

allude

Meaning
To refer to something indirectly or casually.
Example
The professor alluded to Shakespeare during the lecture.
C1 adjective /ɔːlˈmaɪ.ti/

Almighty

Meaning
having unlimited power; omnipotent
Example
The almighty storm destroyed everything in its path.
C1 adjective /əˈbaɪdɪŋ/

abiding

Meaning
lasting for a long time; enduring
Example
She had an abiding love for her hometown.
C1 adjective /ˈɑːrɡjuəbl/

arguable

Meaning
open to debate or discussion; not certain and capable of being argued for or against
Example
It is arguable that technology has improved our quality of life.
C1 adverb /əˈlɒft/

aloft

Meaning
Up in or into the air; overhead.
Example
The kite was flying aloft in the clear sky.
C1 noun /ˈæk.jʊ.mən/

acumen

Meaning
The ability to make good judgments and quick decisions; keenness and depth of perception.
Example
His business acumen helped the company grow rapidly.
C1 noun /əˈlɜːrtnəs/

alertness

Meaning
the state of being mentally aware and quick to notice or respond; vigilance
Example
The driver maintained a high level of alertness during the long journey.
C1 noun /ˈæb.stɪ.nəns/

abstinence

Meaning
the practice of restraining oneself from indulging in something, typically alcohol or sex
Example
His doctor advised abstinence from alcohol for better health.
C1 adjective /əˈtjuːnd/

attuned

Meaning
Being receptive or sensitive to something; well adjusted or in harmony.
Example
She is attuned to the needs of her students.
C1 noun /ədˈhɪərənt/

adherent

Meaning
a person who supports or follows a particular belief, cause, or leader
Example
He is a strong adherent of democratic values.
C1 adjective /ˈeɪ.mi.ə.bəl/

Amiable

Meaning
friendly and pleasant; good-natured; kind
Example
My neighbor is very amiable and always greets everyone warmly.
C1 noun /ˈeɪ.peks/

apex

Meaning
The highest point or peak of something; the top or summit.
Example
He reached the apex of his career.
C1 noun /əˈkʌmpənɪmənt/

accompaniment

Meaning
Something that goes together with or complements another thing, often music or food.
Example
The dish was served with a spicy sauce as an accompaniment.
C1 noun, verb /əˈsɛnt/

assent

Meaning
To agree to something, especially after careful consideration; an expression of approval.
Example
She nodded her head in silent assent.
C1 verb /ˌæprɪˈhɛnd/

apprehend

Meaning
to arrest or seize someone; to understand or perceive something
Example
The police managed to apprehend the thief after a long chase.
C1 noun /ˈælɪɡəri/

allegory

Meaning
a story, poem, or picture that can be interpreted to reveal a hidden meaning, often moral or political
Example
The novel is an allegory of the struggle between good and evil.
C1 noun /əˈsɪdɪti/

acidity

Meaning
the quality or degree of being acidic; the amount of acid present in a substance
Example
The acidity of the soil affects how well crops grow.
C1 noun /əˈliː.dʒəns/

allegiance

Meaning
Loyalty or commitment of a subordinate to a superior or of an individual to a group or cause.
Example
Soldiers take an oath of allegiance to their country.
C1 adjective /ˌeɪ.bəlˈbɒd.id/

able-bodied

Meaning
physically strong and healthy, not disabled
Example
The company is looking for able-bodied workers for the construction site.
C1 noun /ˈæd.vənt/

advent

Meaning
The arrival of a notable person, thing, or event.
Example
The advent of the internet changed the way people communicate.
C1 adjective /ˈæntɪkweɪtɪd/

antiquated

Meaning
Old-fashioned or outdated.
Example
The office still uses an antiquated filing system.
C1 verb /ˈædʒ.ɪ.teɪt/

agitate

Meaning
to stir up feelings or disturb; to campaign for change
Example
The protesters agitated for better working conditions.
C1 noun /ˈænvɪl/

anvil

Meaning
A heavy iron block used by blacksmiths for hammering and shaping metal.
Example
The blacksmith placed the hot iron on the anvil.
C1 adjective /ˌæprɪˈhɛnsɪv/

apprehensive

Meaning
feeling anxious or fearful that something bad will happen
Example
He was apprehensive about starting a new job in a foreign country.
C1 adjective ˈɑː.dʒu.əs

arduous

Meaning
Involving or requiring strenuous effort; difficult and tiring.
Example
The trek through the mountains was an arduous journey.
C1 noun /ɑːˌtɪkjʊˈleɪʃən/

articulation

Meaning
The action of putting into words an idea or feeling of a specified type.
Example
His articulation during the debate impressed everyone.
C1 verb /əˈtjuːn/

attune

Meaning
to make someone or something aware of or responsive to something; to adjust or harmonize
Example
She quickly attuned herself to the needs of her new team.
C1 noun /ˈædʒʌŋkt/

adjunct

Meaning
a thing added to something else as a supplementary part
Example
The professor worked as an adjunct at the university.
C1 noun /əˈpɒsəl/

apostle

Meaning
A vigorous and pioneering advocate or supporter of a particular cause, often used for the early Christian disciples.
Example
He became an apostle of environmental protection.
C1 adjective /əˈwɒʃ/

awash

Meaning
covered or flooded with water or something in large quantities
Example
The market was awash with cheap imported goods.
C1 noun /ˌæntɪˈsiːdənt/

antecedent

Meaning
something that came before; a previous event, condition, or cause
Example
The cultural antecedents of this festival go back centuries.
C1 adjective /ɑːrˈkeɪɪk/

archaic

Meaning
very old or old-fashioned; belonging to an earlier time
Example
Some laws are considered archaic and no longer relevant.
C1 noun /əˈluːʒən/

allusion

Meaning
An indirect reference to something without mentioning it explicitly.
Example
Her story contained an allusion to a famous myth.
C1 noun, verb, adjective /ˈæɡ.rɪ.ɡət/ (noun/adjective), /ˈæɡ.rɪ.ɡeɪt/ (verb)

aggregate

Meaning
A whole formed by combining several elements; to combine into a total.
Example
The data was aggregated to provide a clearer picture of the market.
C1 adjective, verb /ˈeɪlɪŋ/

ailing

Meaning
suffering from illness or poor health; experiencing problems or decline
Example
The ailing patient slowly began to recover after treatment.
C1 noun /ænˈtɪθəsɪs/

antithesis

Meaning
A person, thing, or idea that is the direct opposite of another; a rhetorical device contrasting opposing ideas in parallel structure.
Example
Love is the antithesis of hate.