aeronaut
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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 noun /əˈkjuːtnəs/

acuteness

Meaning
sharpness of mind or senses; severity or intensity of a condition
Example
Her acuteness allowed her to notice details others missed.
C2 adjective /əˈsiːtɪk/

acetic

Meaning
relating to or containing acetic acid; sour or vinegary in taste or smell
Example
The acetic smell of vinegar filled the kitchen.
C2 noun /ˈɔːspɪs/

auspice

Meaning
A sign, omen, or divine token; also refers to protection or support.
Example
The project was launched under the auspice of the government.
C2 noun /əˈnæθəmə/

anathema

Meaning
something or someone intensely disliked or strongly condemned
Example
Violence is anathema to her peaceful nature.
C2 verb /əˈɡrɛs/

aggress

Meaning
to initiate an attack or show hostile behavior
Example
The army chose not to aggress without provocation.
C2 adjective /ˌæf.əˈrɪs.tɪk/

aphoristic

Meaning
expressed in the style of a short, witty saying
Example
Her writing style is concise and aphoristic.
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 /ænˈdrɒdʒɪnəs/

androgynous

Meaning
Having both male and female characteristics; not clearly masculine or feminine.
Example
The fashion show featured models with an androgynous look.
C2 noun /ˈæsənəns/

assonance

Meaning
the repetition of vowel sounds in nearby words in poetry or prose
Example
The poet used assonance to create a musical effect in his verse.
C2 noun /əˈspær.ə.ɡəs biːn/

Asparagus bean

Meaning
a long, thin green vegetable pod that grows on vines; also known as yard-long bean
Example
The asparagus bean grows up to three feet long and is commonly used in Asian cooking.
C2 noun /ˈæktʃuˌɛri/

actuary

Meaning
A professional who analyzes financial risk using mathematics, statistics, and financial theory, especially in insurance and pensions.
Example
The actuary calculated the risk before finalizing the insurance policy.
C2 adjective /ˈæmbjələˌtɔːri/

ambulatory

Meaning
Relating to or able to walk; relating to outpatient medical care.
Example
The patient is ambulatory and does not require bed rest.
C2 verb /əˈbɛt/

abet

Meaning
to encourage or assist someone to commit a crime or wrongdoing
Example
He was accused of abetting the criminals in their escape.
C2 noun /əˈnæb.ə.lɪ.zəm/

anabolism

Meaning
The set of metabolic pathways that construct molecules from smaller units, involving tissue repair and growth.
Example
Anabolism is essential for muscle growth and tissue repair.
C2 adjective /ˌæntɪˈθɛtɪkəl/

antithetical

Meaning
Directly opposed or contrasted; mutually incompatible.
Example
His views were antithetical to the values of the organization.
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 adjective /əˈkɪliən/

achillean

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

assay

Meaning
To test or analyze the quality, purity, or content of a substance; the act of such testing.
Example
The scientists assayed the mineral sample for gold content.
C2 noun /ˈæpəplɛksi/

apoplexy

Meaning
A sudden loss of consciousness or control due to stroke or extreme anger.
Example
The old man nearly had apoplexy when he heard the shocking news.
C2 noun /ˌænθrəpəˈsɛntrɪzəm/

anthropocentrism

Meaning
The belief that human beings are the most important or central element of existence.
Example
Anthropocentrism often shapes environmental policies.
C2 noun /ˈɑːr.bɪ.trɑːʒ/

arbitrage

Meaning
The simultaneous buying and selling of securities in different markets to take advantage of differing prices.
Example
Investors use arbitrage to make profits in global markets.
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 /əˈsper.ɪ.ti/

asperity

Meaning
Harshness of tone, manner, or surface.
Example
She spoke with asperity when she was interrupted.
C2 noun /ˈeɪ.pi.ə.rɪst/

apiarist

Meaning
a person who keeps and tends bees for honey production
Example
The apiarist collected fresh honey from the hives.
C2 noun /ˌæriˈviːst/

arriviste

Meaning
A person who has recently gained wealth or status but is considered arrogant or socially unsophisticated.
Example
The business world is full of ambitious arrivistes.
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 /əˈɡrɒnəmɪst/

agronomist

Meaning
A scientist who studies soil management and crop production.
Example
The agronomist suggested new methods to improve rice yields.
C2 adjective /ˌæntɪˈmʌndeɪn/

antemundane

Meaning
Existing or occurring before the creation of the world.
Example
Some myths speak of an antemundane chaos before order was established.
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 verb /əˈɡræn.daɪz/

aggrandize

Meaning
To increase the power, wealth, or importance of a person or entity.
Example
The politician tried to aggrandize himself through exaggerated claims.
C2 adjective /æbˈstiːmiəs/

abstemious

Meaning
not allowing oneself much food or drink; marked by moderation
Example
She lived an abstemious life, avoiding all luxuries.
C2 verb /əˈbrɪdʒ/

abridge

Meaning
to shorten a text without losing its meaning
Example
The editor decided to abridge the long novel for young readers.
C2 noun /ˈænɪməs/

animus

Meaning
A strong feeling of hostility; motivation or purpose behind an action.
Example
His speech was driven by animus against the policy.
C2 verb /əˈsɛvəˌreɪt/

asseverate

Meaning
to affirm or declare positively and earnestly
Example
He asseverated that he had never seen the man before.
C2 noun əˈdrɔɪt.nəs

adroitness

Meaning
Cleverness or skill, especially in using the hands or mind; skillful dexterity.
Example
His adroitness in negotiations secured the deal.
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 /əˈlɪtəreɪt/

alliterate

Meaning
to repeat the same consonant sound at the beginning of words in a phrase or sentence
Example
The poet often alliterates words to create rhythm.
C2 noun /ˈæpəˌlɔːɡ/

apologue

Meaning
a short moral story or fable intended to teach a lesson
Example
The teacher used an old apologue to explain honesty to the children.
C2 noun /ˈɔːldər/

alder

Meaning
A type of tree from the birch family that typically grows in wet ground and has simple, serrated leaves.
Example
The alder trees grew thick along the riverbank.
C2 adjective /ɔːˈrɪkjʊlər/

auricular

Meaning
Relating to the ear or hearing.
Example
The doctor used an auricular thermometer to check the patient's temperature.
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 noun /ˈæmɪti/

amity

Meaning
A friendly relationship between people or countries.
Example
The treaty helped maintain amity between the neighboring nations.
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 adjective /əˈkjuː.zəˌtɔːr.i/

accusatory

Meaning
Suggesting blame or indicating someone has done wrong.
Example
He gave her an accusatory glance.
C2 noun /ˈɑːrtɪfɪs/

artifice

Meaning
clever or cunning devices or tricks used to deceive others
Example
The politician's charm was nothing but artifice.
C2 adjective /əˈluːsɪv/

allusive

Meaning
Making indirect references or hints; suggestive without being explicit.
Example
The novel is full of allusive passages that point to classical literature.
C2 verb /əˈkɒst/

accost

Meaning
to approach and speak to someone boldly or aggressively
Example
The reporter was accosted by protesters outside the courthouse.
C2 adjective/adverb /ˌæ.prəˈpoʊ/

apropos

Meaning
Appropriate to the situation; relevant. As an adverb, it means 'with reference to' or 'regarding'.
Example
His comments were not apropos of the discussion.
C2 verb /əˈpraɪz/

apprise

Meaning
to inform or notify someone
Example
The manager will apprise the staff of the new policies.
C2 verb əˈmiːljəreɪt

ameliorate

Meaning
To make better; improve or enhance something.
Example
The new policies are designed to ameliorate living conditions.
C2 verb /əˈbɑː.mə.neɪt/

abominate

Meaning
to feel hatred or loathing for something
Example
She abominates cruelty to animals.
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 verb /əˈvaʊ/

avow

Meaning
to openly declare or admit something, often publicly and firmly
Example
He avowed his loyalty to the cause without hesitation.
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 /ˈɔːɡjʊri/

augury

Meaning
A sign or omen that is believed to predict future events.
Example
The dark clouds were seen as an augury of an approaching storm.
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 verb /ˈædjʊˌleɪt/

adulate

Meaning
to praise or flatter excessively
Example
The fans adulated the actor after his performance.
C2 noun /ˈɑːrbər/

arbor

Meaning
a shady garden shelter formed by trees, climbing plants, or latticework
Example
They rested under the arbor covered with roses.
C2 adjective /əˌnækrəˈnɪstɪk/

anachronistic

Meaning
belonging to a period other than that being portrayed; old-fashioned or outdated
Example
His views on gender roles are considered anachronistic.
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 /ˈæməˌtɔːri/

amatory

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

abnegation

Meaning
the act of renouncing or rejecting something, especially self-denial
Example
The monk’s life was one of complete abnegation of worldly pleasures.
C2 noun /əˈfleɪtəs/

afflatus

Meaning
a sudden divine inspiration or creative impulse
Example
The poet wrote the verses under a sudden afflatus of inspiration.
C2 noun /əˌbɑː.məˈneɪ.ʃən/

abomination

Meaning
a thing that causes disgust or hatred
Example
Slavery was considered an abomination.
C2 verb /əbˈskɒnd/

abscond

Meaning
to leave secretly and quickly, often to avoid arrest or punishment
Example
The thief tried to abscond with the stolen jewelry.
C2 noun /əˈfreɪ/

affray

Meaning
A public fight or noisy disturbance that causes alarm.
Example
The police were called to break up an affray outside the stadium.
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 /ˈɑːm.lət/

Armlet

Meaning
a band worn around the upper arm as an ornament
Example
The traditional dancer wore golden armlets that gleamed in the spotlight.
C2 adjective /eɪˈrɪðmɪk/

arrhythmic

Meaning
Lacking a regular rhythm or beat.
Example
The patient had an arrhythmic heartbeat.
C2 verb /ˌækwiˈɛs/

acquiesce

Meaning
to accept something reluctantly but without protest
Example
She decided to acquiesce to her parents’ wishes.
C2 adverb /ˌeɪˈmɔːrəli/

amorally

Meaning
In a way that shows no concern about whether behavior is morally right or wrong.
Example
He acted amorally, ignoring the consequences of his actions.
C2 noun /ˌækwəˈpɒnɪks/

aquaponics

Meaning
A system of aquaculture in which the waste produced by farmed fish or other aquatic animals supplies nutrients for plants grown hydroponically.
Example
Aquaponics efficiently utilizes water by integrating fish and plant farming.
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 /ˌɔːltərˈkeɪʃən/

altercation

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

addle

Meaning
To confuse or muddle someone’s mind.
Example
The complicated instructions only served to addle him.
C2 noun /ˈɛəri/

aerie

Meaning
A large nest of a bird of prey, especially an eagle, typically built high in a tree or on a cliff.
Example
The eagle built its aerie on the high cliff.
C2 adjective /ˈæsɪnaɪn/

asinine

Meaning
Extremely foolish or stupid.
Example
It was an asinine idea to drive into the storm without checking the weather.
C2 adjective /ɔːˈɡʌst/

august

Meaning
Respected and impressive; inspiring reverence or admiration.
Example
The king entered the hall with an august presence.
C2 noun /ˈæltruɪst/

altruist

Meaning
a person who has an unselfish concern for the welfare of others
Example
He is an altruist who always puts others' needs before his own.
C2 noun /əˈklɪvɪti/

acclivity

Meaning
An upward slope or incline on the ground.
Example
The hikers struggled as they climbed the steep acclivity.
C2 verb /əˈfaɪəns/

affiance

Meaning
to promise or pledge marriage; to formally engage
Example
They decided to affiance after years of friendship.
C2 verb /əˈreɪn/

arraign

Meaning
to formally accuse someone in a court of law and ask them to respond to the charges
Example
The suspect was arraigned before the judge this morning.
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 /ˈæmjʊlət/

Amulet

Meaning
an ornament or small piece of jewelry thought to give protection against evil, danger, or disease
Example
She wore a silver amulet around her neck for good luck.
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 /əˌnʌn.siˈeɪ.ʃən/

annunciation

Meaning
The announcement of something; in Christianity, the announcement by the angel Gabriel to Mary that she would conceive Jesus.
Example
The church celebrated the Feast of the Annunciation with a special service.
C2 adjective /æbˈstruːs/

abstruse

Meaning
Difficult to understand; obscure.
Example
The abstruse nature of the philosophical debate left many confused.
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 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 /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 noun /ˈæmpərˌsænd/

ampersand

Meaning
The symbol '&' used to represent the word 'and'.
Example
Use an ampersand instead of writing the word 'and' in the company name.
C2 adjective /ˌæntɪməˈrɪdiən/

antemeridian

Meaning
Relating to the time before noon; occurring in the morning.
Example
She scheduled all her important meetings during the antemeridian hours.
C2 adjective, noun /ˈænθrəpɔɪd/

anthropoid

Meaning
Resembling a human being in form; a primate such as apes and monkeys.
Example
The gorilla is considered an anthropoid ape.
C2 adjective /ænˈhaɪdrəs/

anhydrous

Meaning
Containing no water.
Example
The chemist used anhydrous ammonia for the experiment.
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 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 adjective /ˈæbdʒɛkt/

abject

Meaning
extremely bad, unpleasant, and degrading
Example
They lived in abject poverty.
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 verb /əˈnɔɪnt/

anoint

Meaning
To smear or rub with oil, often as part of a religious ceremony or as a sign of consecration.
Example
The priest anointed the king with holy oil.
C2 noun /ˈɪəri/ or /ˈɛəri/

aery

Meaning
An eagle’s nest, or a lofty, airy dwelling.
Example
The eagle perched proudly near its aery high on the cliff.
C2 noun /ˈæsɪˌteɪt/

acetate

Meaning
a salt or ester of acetic acid; a synthetic material used in textiles and film
Example
The company produces acetate fibers for clothing.
C2 verb /ænˈtɪpəθaɪz/

antipathize

Meaning
to feel or express a strong dislike or aversion toward something or someone
Example
He seemed to antipathize with the new management's approach.
C2 noun /əˈdjuː/

adieu

Meaning
A farewell or goodbye, often used in a formal or poetic sense.
Example
She bid her friends adieu before leaving for France.
C2 adjective /ˌækrəˈmætɪk/

achromatic

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

antedate

Meaning
to be earlier in time; to assign a date earlier than the actual one
Example
The manuscript antedates the modern printing press.
C2 adjective /ˈæpəzɪt/

apposite

Meaning
highly appropriate or relevant to what is being discussed
Example
Her remark was particularly apposite to the situation.
C2 adverb /əˈθwɔːrt/

athwart

Meaning
Across or in opposition to something.
Example
A fallen tree lay athwart the road, blocking traffic.
C2 adverb /əˈbɛd/

abed

Meaning
in bed
Example
She stayed abed all day due to illness.
C2 noun /əˈspɜːr.ʒən/

aspersion

Meaning
An attack on the reputation or integrity of someone.
Example
He cast an aspersion on her character.
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 adjective /æmˈbroʊʒiəl/

ambrosial

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

agglomeration

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

apparition

Meaning
A ghostly figure or an unusual or unexpected appearance.
Example
The children were frightened by the sudden apparition in the old house.
C2 adjective /əˈluːviəl/

alluvial

Meaning
Relating to or derived from alluvium (loose soil or sediment deposited by rivers).
Example
The farmers cultivate crops on the fertile alluvial plains.
C2 noun /əˈstɪɡmətɪzəm/

astigmatism

Meaning
An eye defect causing blurred vision due to irregular curvature of the cornea or lens.
Example
She wears glasses to correct her astigmatism.
C2 noun /əˈkwɪtəns/

acquittance

Meaning
a written receipt acknowledging payment or discharge of a debt
Example
He demanded an acquittance after paying the loan.