aseptic
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C2 adjective /eɪˈsɛptɪk/

aseptic

Meaning
Free from contamination caused by harmful microorganisms; sterile.
Example
Surgeons must work in an aseptic environment to prevent infection.
C2 verb /ˈæd.l̩/

addle

Meaning
To confuse or muddle someone’s mind.
Example
The complicated instructions only served to addle him.
C2 adjective /əˈbɑː.mə.nə.bəl/

abominable

Meaning
causing moral revulsion; extremely unpleasant
Example
The prisoners were kept in abominable conditions.
C2 adjective /ɔːˈrɔːrəl/

auroral

Meaning
Relating to or resembling the aurora, especially the northern lights.
Example
The scientists observed auroral activity in the night sky.
C2 adjective /ɔːˈɡʌst/

august

Meaning
Respected and impressive; inspiring reverence or admiration.
Example
The king entered the hall with an august presence.
C2 adjective əˈsɪd.ju.əs

assiduous

Meaning
Showing great care and perseverance; diligent and hardworking.
Example
His assiduous efforts led to a successful career.
C2 adjective /ˌænθrəpəˈmɔːrfɪk/

anthropomorphic

Meaning
attributing human characteristics to non-human things, like animals or objects
Example
The cartoon shows an anthropomorphic cat walking on two legs.
C2 verb /əˈbeɪs/

abase

Meaning
to belittle or degrade someone
Example
He refused to abase himself before the king.
C2 noun /əˈsɜːrbəti/

acerbity

Meaning
bitterness or sharpness of tone, manner, or taste
Example
The acerbity of his remarks left everyone silent.
C2 noun /ænˈtɪlədʒi/

antilogy

Meaning
A contradiction in terms or ideas; inconsistency in speech or writing.
Example
The politician's statement was criticized for its antilogy.
C2 noun /əˈzeɪ.li.ə/

azalea

Meaning
a flowering shrub with brightly colored blooms, often grown ornamentally
Example
The garden was full of blooming azaleas in spring.
C2 noun /ænˈtɪfəni/

antiphony

Meaning
a form of music in which two or more groups or choirs sing alternately in response to each other
Example
The cathedral's architecture was designed to enhance the effect of antiphony.
C2 adjective /əˈsɪdjʊləs/

acidulous

Meaning
slightly sour or sharp in taste or manner
Example
The critic wrote an acidulous review of the movie.
C2 noun /ˌɛərəˈstætɪks/

aerostatics

Meaning
The branch of physics that deals with the equilibrium of air and gases and the forces acting on bodies in them.
Example
Aerostatics is essential for understanding how balloons float.
C2 verb /əˈdjuːs/

adduce

Meaning
To provide evidence or reasons to support an argument or idea.
Example
The lawyer adduced several examples to support his case.
C2 noun /əˈrɪə/

arrear

Meaning
A debt or payment that is overdue and unpaid.
Example
He was sued for an arrear of rent.
C2 noun /ˌær.əˈbesk/

arabesque

Meaning
a complex, ornate design featuring intertwined flowing lines, often used in architecture or ballet poses
Example
The ceiling was decorated with delicate arabesque patterns.
C2 noun /əˈkriːʃən/

accretion

Meaning
The process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Example
The accretion of wealth allowed him to invest in various projects.
C2 noun /ˈɑːrbɪtər/

arbiter

Meaning
a person who has the authority to settle a dispute or decide an issue
Example
The principal acted as the arbiter in the conflict between the students.
C2 noun /ˌæpəˈzɪʃən/

apposition

Meaning
a grammatical construction in which two elements are placed side by side, with one explaining the other
Example
In the phrase 'my friend John,' the word 'John' is in apposition to 'my friend.'
C2 verb /əˈfaɪəns/

affiance

Meaning
to promise or pledge marriage; to formally engage
Example
They decided to affiance after years of friendship.
C2 adjective /ɑːrˈθʊr.i.ən/

arthurian

Meaning
Relating to the legendary King Arthur and the stories surrounding him.
Example
The novel is set in an Arthurian world of knights and castles.
C2 verb /əˈɡlɒməˌreɪt/

agglomerate

Meaning
To collect or form into a mass or group.
Example
The dust particles began to agglomerate into larger clusters.
C2 verb /ˌænɪmədˈvɜːt/

animadvert

Meaning
To comment critically or unfavorably.
Example
The teacher animadverted on the student's careless mistakes.
C2 noun /əˈfeɪ.ʒə/

aphasia

Meaning
a medical condition that causes loss of ability to speak or understand language
Example
After the stroke, she was diagnosed with aphasia.
C2 adjective /æbˈhɔːr.ənt/

Abhorrent

Meaning
extremely unpleasant and causing disgust; detestable
Example
The idea of animal cruelty is abhorrent to most people.
C2 noun /əˈmʊr/

amour

Meaning
A secret or illicit love affair.
Example
The novel tells the story of a forbidden amour between two characters.
C2 adjective /eɪˈsɛfələs/

acephalous

Meaning
having no leader or head; headless
Example
The acephalous group soon fell into disorganization.
C2 verb /əˈbʌt/

abut

Meaning
to be next to or share a border with
Example
The park abuts the river on the north side.
C2 noun /ˈɔːldərmən/

alderman

Meaning
An elected member of a municipal council in certain cities and towns.
Example
The alderman proposed a new plan for community parks.
C2 noun /ˈæbɪs/

abbess

Meaning
the woman in charge of a convent of nuns
Example
The abbess welcomed the visitors to the convent.
C2 adjective /ˈæprəbəˌtɔːri/

approbatory

Meaning
expressing approval or praise
Example
The teacher gave an approbatory nod after reading the essay.
C2 noun /ˈæn.dʒi.əʊ.plæs.ti/

angioplasty

Meaning
A medical procedure to open blocked or narrowed blood vessels that supply blood to the heart.
Example
Angioplasty is now safer with robotic assistance.
C2 noun /əˈkʌmpənɪst/

accompanist

Meaning
A person who plays a musical instrument to support a singer or another musician.
Example
The pianist served as the accompanist for the singer during the concert.
C2 noun /ˌæk.wiˈes.əns/

acquiescence

Meaning
The reluctant acceptance of something without protest.
Example
His silent acquiescence to unfair rules was surprising.
C2 noun /ˈækmi/

acme

Meaning
the highest point of achievement or excellence
Example
Winning the award was the acme of his career.
C2 noun /ˌɔːskʌlˈteɪʃən/

auscultation

Meaning
The act of listening to internal sounds of the body, typically using a stethoscope.
Example
The doctor performed auscultation to check the patient’s lungs.
C2 noun /ˈeɪ.viˌɛr.i/

aviary

Meaning
a large enclosure for keeping birds
Example
The zoo built a new aviary for exotic parrots.
C2 adjective /əˈkwɪzətɪv/

acquisitive

Meaning
excessively interested in acquiring money or material things
Example
The acquisitive businessman bought every piece of land he could find.
C2 noun /ˈɑːrɡoʊ/

argot

Meaning
the specialized vocabulary or jargon of a particular group, especially one with a common interest or occupation
Example
The thieves communicated in an argot that outsiders could not understand.
C2 noun /əˈnjuː.ɪ.ti/

annuity

Meaning
a fixed sum of money paid to someone each year, typically for the rest of their life
Example
She receives an annuity from her late husband's insurance policy.
C2 noun /ˈæn.oʊd/

anode

Meaning
The positive electrode in a device such as a battery, where current flows into a polarized electrical device.
Example
The anode of the battery was corroded after long use.
C2 noun /ˈæn.əlz/

annals

Meaning
Historical records of events, usually arranged chronologically.
Example
Her name will be remembered in the annals of science.
C2 noun /əˈrɔɪ.oʊ/

arroyo

Meaning
A dry creek or stream bed that temporarily fills with water after heavy rain.
Example
After the storm, the arroyo quickly filled with rushing water.
C2 noun /əˈpɜːrtənənsɪz/

appurtenances

Meaning
Additional items or accessories associated with something, often used in a legal or property context.
Example
The house was sold along with all its appurtenances, including the garage and garden.
C2 adjective /ədˈmɒnɪtəri/

admonitory

Meaning
giving or conveying a warning or reprimand
Example
She gave him an admonitory glance.
C2 noun /əˈdɛpt.nəs/

adeptness

Meaning
Skill and dexterity in a task.
Example
His adeptness in negotiations helped close the deal successfully.
C2 adjective /ˈæn.ə.daɪn/

anodyne

Meaning
Not likely to cause offense; bland or harmless. Also refers to something that relieves pain.
Example
The speaker’s anodyne remarks avoided controversy.
C2 noun /ˈiːɒn/ or /ˈiːən/

aeon

Meaning
An indefinitely long period of time; an age or eternity.
Example
Dinosaurs roamed the Earth millions of aeons ago.
C2 noun /ˌædjʊˈleɪʃən/

adulation

Meaning
excessive admiration or flattery
Example
The singer enjoyed the adulation of her fans.
C2 noun, verb /əˈfrʌnt/

affront

Meaning
An action or remark that causes outrage or offense.
Example
He took her criticism as a personal affront.
C2 adjective /ˌænθrəpəˈmɔːrfəs/

anthropomorphous

Meaning
having the form or attributes of a human
Example
The statue had an anthropomorphous shape resembling a human.
C2 verb /ˌæntɪˈsiːd/

antecede

Meaning
to come before in time or order
Example
A short introduction usually antecedes the main text.
C2 adverb /əˈsɪdʒuəsli/

assiduously

Meaning
with great care and persistence
Example
He worked assiduously to complete the project before the deadline.
C2 adjective /ˈæfərənt/

afferent

Meaning
carrying impulses toward a central organ or part, especially toward the brain or spinal cord
Example
Afferent nerves carry signals from the body to the brain.
C2 adjective /ˈæfəbəl/

affable

Meaning
friendly, easy to talk to, and pleasant in manner
Example
He is such an affable host that everyone feels comfortable at his parties.
C2 noun /ˌæntiˈsaɪkloʊn/

anticyclone

Meaning
A weather system with high atmospheric pressure at its center, usually bringing calm and clear conditions.
Example
An anticyclone brought sunny weather across the region.
C2 noun /əˈpɒθəˌkɛri/

apothecary

Meaning
A historical term for a person who prepared and sold medicines and drugs.
Example
The village apothecary provided remedies for many common illnesses.
C2 verb /əkˈsiːd/

accede

Meaning
to agree to a request, proposal, or demand; to assume an office or position
Example
The government finally acceded to the demands of the protesters.
C2 noun /ˈɛərəˌnɔːt/

aeronaut

Meaning
A person who travels in an airship, balloon, or other aircraft.
Example
The aeronaut skillfully guided the hot-air balloon across the valley.
C2 adjective /ˌævəˈrɪʃəs/

avaricious

Meaning
having or showing extreme greed for wealth or material gain
Example
The avaricious landlord increased the rent unfairly.
C2 noun /əˈdʌltərənt/

adulterant

Meaning
a substance added to something else, often food or drink, to reduce its quality or strength
Example
The laboratory found an adulterant in the milk samples.
C2 verb /əˈvʌls/

avulse

Meaning
to tear away or separate forcibly, especially in medical or geological contexts
Example
The surgeon had to avulse the damaged tissue during the operation.
C2 noun /əˈpɒfəsɪs/

apophasis

Meaning
A rhetorical device where the speaker brings up a subject by denying it or pretending to pass over it.
Example
The politician used apophasis by saying, 'I won’t even mention my opponent’s scandals.'
C2 noun /ˈæmɪti/

amity

Meaning
A friendly relationship between people or countries.
Example
The treaty helped maintain amity between the neighboring nations.
C2 adjective /əˈsɛt.ɪk/

ascetic

Meaning
Practicing strict self-denial and abstaining from worldly pleasures, often for religious reasons.
Example
He lived an ascetic life in the mountains, far from worldly comforts.
C2 noun (plural) /ˈɔːspɪsɪz/

auspices

Meaning
Patronage, support, or guidance, often used in the phrase 'under the auspices of'.
Example
The conference was held under the auspices of the United Nations.
C2 verb /əˈkuːtər/

accouter

Meaning
to equip or outfit, typically with military or ceremonial attire
Example
The soldiers were accoutered in full battle gear.
C2 noun ˌæɡ.roʊˈiː.koʊˌsɪs.təm

agroecosystem

Meaning
An ecological system centered on agricultural activities and processes.
Example
A healthy agroecosystem improves soil fertility.
C2 noun /ˌæk.rəˈfoʊ.bi.ə/

acrophobia

Meaning
An extreme or irrational fear of heights.
Example
Her acrophobia prevented her from climbing the tall building.
C2 adverb /əˈmʌk/

amok

Meaning
Behaving uncontrollably and disruptively.
Example
The angry mob ran amok after the verdict was announced.
C2 noun əˌdʌl.təˈreɪ.ʃən

adulteration

Meaning
The action of making something poorer in quality by the addition of another substance.
Example
Adulteration of food is a serious health risk.
C2 noun /əˈreɪ.bi.ən ˈdʒæz.mɪn/

Arabian Jasmine

Meaning
A fragrant white flower native to South and Southeast Asia, commonly used in perfumes and religious ceremonies
Example
The Arabian jasmine filled the garden with its sweet fragrance.
C2 noun /ˈætəmaɪzər/

atomizer

Meaning
A device that sprays liquid into a fine mist.
Example
She used an atomizer to apply the perfume evenly.
C2 verb /ˈæd.ʌm.breɪt/

adumbrate

Meaning
to foreshadow or suggest something in an unclear or indirect way
Example
The report adumbrates future economic challenges.
C2 noun /əˈbrɪdʒmənt/

abridgment

Meaning
A shortened version of a larger work, such as a book or speech.
Example
The publisher released an abridgment of the lengthy novel for students.
C2 noun /ˈæl.kə.laɪ ækt/

Alkali Act

Meaning
A British law passed in 1863 to regulate the emission of hydrochloric acid gas from alkali works, representing one of the first pieces of environmental legislation.
Example
The Alkali Act of 1863 was one of the first environmental laws.
C2 noun /ˌæntɪˈtɒksɪn/

antitoxin

Meaning
A substance that neutralizes a specific toxin in the body.
Example
The doctor administered an antitoxin to counter the snake venom.
C2 verb /æbˈdʒʊər/

abjure

Meaning
to formally renounce or give up a belief, cause, or claim
Example
He abjured his allegiance to the old regime.
C2 verb /əˈbæʃ/

abash

Meaning
to make someone feel embarrassed or ashamed
Example
Her sudden question seemed to abash him.
C2 adjective /ˌækrəˈmætɪk/

achromatic

Meaning
without color; free from color
Example
The designer chose an achromatic palette of black, white, and gray.
C2 adjective /ˈæməˌtɔːri/

amatory

Meaning
Relating to or expressing sexual love.
Example
The poet’s verses were filled with amatory themes.
C2 noun /ˈeɪʒən siː bæs/

Asian sea bass

Meaning
a large predatory fish found in coastal waters and estuaries of the Indo-Pacific region, prized for its white meat
Example
Asian sea bass is highly valued in aquaculture for its fast growth.
C2 verb /əˈbreɪd/

abrade

Meaning
to scrape or wear away the surface by friction or erosion
Example
The rough cloth can easily abrade the skin.
C2 adjective /æmˈbroʊʒiəl/

ambrosial

Meaning
Exceptionally pleasing to taste or smell; divine.
Example
The aroma of freshly baked bread was simply ambrosial.
C2 noun /ˈænsɛstrɪs/

ancestress

Meaning
a female ancestor; a woman from whom one is descended
Example
She discovered that her ancestress came from a small village in Bengal.
C2 adjective /ˌæktʃuˈɛəriəl/

actuarial

Meaning
Relating to actuaries or their work of analyzing financial risk and uncertainty, especially in insurance and pensions.
Example
The company relied on actuarial reports to set insurance premiums.
C2 noun ˌæɡ.roʊˈfɔːr.ɪ.stri

agroforestry

Meaning
A land use management system in which trees or shrubs are grown around or among crops or pastureland.
Example
Agroforestry improves soil quality and crop yield.
C2 noun /ˈændaɪərn/

andiron

Meaning
a metal support used in a fireplace to hold logs
Example
The logs rested on the andirons in the old fireplace.
C2 adjective ˌeə.rəʊˈstæt.ɪk

aerostatic

Meaning
Relating to or involving gases (especially air) in equilibrium and the equilibrium of balloons or aircraft under the influence of such gases.
Example
Aerostatic designs ensure stability at high altitudes.
C2 adjective /əˈkɪliən/

achillean

Meaning
like or characteristic of Achilles; strong but vulnerable
Example
His achillean pride made him blind to danger.
C2 noun /ˌætəlˈjeɪ/

atelier

Meaning
A workshop or studio, especially for an artist or designer.
Example
The painter invited us to his atelier to view his new collection.
C2 noun /ænˈtɪpədiːz/

antipodes

Meaning
places on opposite sides of the Earth; also refers to things that are direct opposites
Example
Australia and Britain are often considered antipodes of each other.
C2 adjective /ˌæn.θrə.pəˈdʒen.ɪk/

anthropogenic

Meaning
Originating in human activity; caused by humans.
Example
Climate change is largely due to anthropogenic activities.
C2 adjective /əˈpɜːrtənənt/

appurtenant

Meaning
Belonging to or associated with something, often used in legal/property contexts.
Example
The right of way is appurtenant to the landowner’s property.
C2 adjective /ˌæpəˈplɛktɪk/

apoplectic

Meaning
Extremely angry; furious.
Example
He was apoplectic when he heard about the unfair decision.
C2 noun/adjective /ˈæl.əˌbæs.tər/

alabaster

Meaning
A fine-grained, usually white variety of gypsum, often used for carving; also describes something smooth and pale like alabaster.
Example
The statue was carved from pure alabaster.
C2 adjective /əˈbɔːrtɪv/

abortive

Meaning
Failing to produce the intended result; unsuccessful.
Example
Their abortive attempt to climb the mountain ended in retreat.
C2 noun /ˈæntɪfɒn/

antiphon

Meaning
a short chant or verse sung responsively in Christian worship, typically sung before or after a psalm or canticle
Example
The choir sang the antiphon before beginning the main hymn.
C2 noun /ˈæntiˌkraɪst/

antichrist

Meaning
A person regarded as the supreme opponent of Christ, often seen as a figure of ultimate evil.
Example
Some people fear the rise of an Antichrist in the future.
C2 noun /əˈnɔɪnt.mənt/

anointment

Meaning
The act of anointing, usually with oil, as part of a ritual or ceremony.
Example
The anointment of the new leader was a sacred ritual.
C2 noun /ˈæpəˌθɛm/

apothegm

Meaning
A short, witty, and instructive saying or maxim.
Example
His speech was filled with apothegms about life and success.
C2 noun /ˌæbsəˈluːʃən/

absolution

Meaning
formal release from guilt, obligation, or punishment
Example
The priest granted him absolution for his sins.
C2 noun /ˈæntɪkwɛri/

antiquary

Meaning
A person who studies, collects, or deals in antiques or ancient objects.
Example
The antiquary spent years collecting rare manuscripts from the medieval period.
C2 noun /əˈspɜːr.ʒən/

aspersion

Meaning
An attack on the reputation or integrity of someone.
Example
He cast an aspersion on her character.
C2 verb /əˈɡrɛs/

aggress

Meaning
to initiate an attack or show hostile behavior
Example
The army chose not to aggress without provocation.
C2 noun /ˈeɪʒən swɒmp iːl/

Asian swamp eel

Meaning
a snake-like freshwater fish that can survive in muddy waters and is considered a delicacy in South Asian cuisine
Example
Asian swamp eel can breathe air and survive in shallow muddy waters.
C2 noun /əˈplɒm/

aplomb

Meaning
Complete and confident self-assurance or poise.
Example
She handled the difficult questions with aplomb.
C2 adjective /əˈkjuː.zəˌtɔːr.i/

accusatory

Meaning
Suggesting blame or indicating someone has done wrong.
Example
He gave her an accusatory glance.
C2 adjective /əˈɡeɪp/ or /əˈɡɑːp/

agape

Meaning
With the mouth wide open in surprise or wonder.
Example
She stood agape at the breathtaking view.
C2 adjective /ɔːˈrɪfərəs/

auriferous

Meaning
Containing or producing gold.
Example
The miners discovered an auriferous vein in the mountains.
C2 noun /æmˈbroʊʒə/

ambrosia

Meaning
The food of the gods in classical mythology; something extremely pleasing to taste or smell.
Example
The dessert was so delicious that it tasted like ambrosia.
C2 noun /ˈɑːrtləsnəs/

artlessness

Meaning
The quality of being natural and simple without deceit or pretension.
Example
Her artlessness made her beloved by all.
C2 noun (plural) /əˈspɜːr.ʒənz/

aspersions

Meaning
Critical or slanderous remarks; multiple attacks on reputation.
Example
The politician rejected the aspersions cast against him.
C2 noun /əˌɡlɒməˈreɪʃən/

agglomeration

Meaning
A mass or collection of things, sometimes clustered together.
Example
The city is an agglomeration of diverse cultures and communities.
C2 noun /ˌɔːltərˈkeɪʃən/

altercation

Meaning
a noisy argument or quarrel
Example
There was a brief altercation between the two drivers.
C2 verb /ˈæmərˌtaɪz/

amortize

Meaning
To gradually reduce or pay off a debt with regular payments.
Example
They plan to amortize the mortgage over 20 years.
C2 adjective /ˈæsənənt/

assonant

Meaning
Having or characterized by assonance; repeating similar vowel sounds.
Example
The poem is filled with assonant words that create a musical rhythm.
C2 adjective /əˈskjuː/

askew

Meaning
Not in a straight or level position; crooked or tilted.
Example
The picture on the wall hung slightly askew.
C2 noun, adjective /ˌæntiˌspæzˈmɒdɪk/

antispasmodic

Meaning
A drug or agent that relieves or prevents muscle spasms.
Example
The doctor prescribed an antispasmodic to ease the pain.
C2 noun /əˈvɪdəti/

avidity

Meaning
extreme eagerness or enthusiasm
Example
He accepted the offer with avidity.