stammer
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C1 verb /ˈstæmər/

stammer

Meaning
To speak with sudden involuntary pauses and a tendency to repeat the initial letters of words.
Example
The nervous student began to stammer during his speech.
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 noun /ˈæl.kə.laɪ/

alkali

Meaning
a soluble base substance, typically with a pH greater than 7, that neutralizes acids
Example
Soap contains alkali which helps remove grease.
C1 adjective /ˈhæpləs/

hapless

Meaning
unfortunate, unlucky, deserving pity
Example
The hapless traveler lost his passport on the very first day.
C1 verb /wiːld/

wield

Meaning
To hold and use a weapon, tool, or power effectively.
Example
The warrior wielded his sword with great skill.
C1 noun speɪst ˌrep.ɪˈtɪʃ.ən

spaced repetition

Meaning
A learning technique that involves reviewing information at increasing intervals to improve long-term retention.
Example
Spaced repetition helps in long-term memory retention.
C1 noun /ˈmæn.juˌskrɪpt/

manuscript

Meaning
a handwritten or typed document, especially a writer’s draft before publication
Example
The author submitted her manuscript to the publisher.
C1 noun /ˈkʌvənənt/

covenant

Meaning
a formal agreement or promise, often legally binding
Example
The landlord and tenant signed a covenant to maintain the property.
C1 adjective /ˈskænti/

Scanty

Meaning
small in size or amount; insufficient; barely adequate
Example
The refugee camp had scanty food supplies.
C1 adjective /səbˈsɪd.i.ər.i/

Subsidiary

Meaning
less important than the main thing; secondary; of or relating to a subsidiary company
Example
The subsidiary company handles all overseas operations.
C1 noun /ˌmiːtiəˈrɒlədʒi/

meteorology

Meaning
The scientific study of the atmosphere and weather.
Example
He chose to specialize in meteorology to study weather patterns.
C1 verb /rɪˈtælieɪt/

retaliate

Meaning
to make an attack in return for a similar attack
Example
The army retaliated after the enemy attack.
C1 noun ˌɪndɪˈspensəbl səˈpɔːrt

indispensable support

Meaning
Essential assistance that cannot be done without; absolutely necessary help.
Example
Volunteers provide indispensable support to communities.
C1 adjective /ˈvæljənt/

Valiant

Meaning
showing courage or determination; brave and heroic
Example
The valiant soldier fought bravely to protect his country.
C1 adjective ˈɒptɪmaɪzd

optimized

Meaning
Made as fully perfect, functional, or effective as possible; improved to achieve maximum efficiency.
Example
The system has been optimized for faster performance.
C1 adjective /ˌɪlɪˈdʒɪtɪmət/

illegitimate

Meaning
Not authorized by law, rules, or standards; not recognized as valid.
Example
The court ruled the contract to be illegitimate.
C1 adjective /ˈɒptɪməm/

optimum

Meaning
Most conducive to a favorable outcome; best.
Example
To achieve optimum results, we need to improve efficiency.
C1 noun /ˈɔːtəkræt/

autocrat

Meaning
A ruler with absolute power.
Example
The autocrat controlled the country with an iron fist.
C1 verb /ˈdʒenərəlaɪz/

generalize

Meaning
To make a broad statement by inferring from specific cases.
Example
It is wrong to generalize based on a few experiences.
C1 preposition/adverb/conjunction /ˌnɒtwɪθˈstændɪŋ/

notwithstanding

Meaning
In spite of; despite
Example
Notwithstanding the challenges, the team completed the project.
C1 adjective /ɪˌlɪzəˈbiːθən/

elizabethan

Meaning
Relating to the reign of Queen Elizabeth I of England (1558–1603), especially the style of that period.
Example
Shakespeare wrote many of his plays during the Elizabethan era.
C1 noun ˈkɒnfluəns

confluence

Meaning
An act or process of merging.
Example
The confluence of ideas from different cultures created a rich discussion.
C1 noun /ˈplæn.teɪn ˈflaʊ.ər/

Plantain flower

Meaning
The flower bud of a banana plant, used as a vegetable in cooking
Example
We cooked plantain flower curry for dinner.
C1 noun /rɪˈpɑːzɪtɔːri/

repository

Meaning
a place where things are stored or kept for safekeeping
Example
The library serves as a repository of knowledge.
C1 adjective ˌɪn.təˈdɪs.ɪ.plɪ.nər.i

interdisciplinary

Meaning
Relating to more than one branch of knowledge.
Example
The interdisciplinary approach in education enhances problem-solving skills.
C1 noun /ˈvendʒəns/

Vengeance

Meaning
punishment inflicted or retribution exacted for an injury or wrong; revenge
Example
He swore to seek vengeance against those who wronged him.
C1 adjective ˈsɪŋ.krə.nəs

synchronous

Meaning
Existing or occurring at the same time.
Example
Synchronous learning involves live online classes.
C1 noun /ˈtoʊɡə/

toga

Meaning
A loose outer garment worn in ancient Rome, typically draped over the shoulders and body.
Example
The senator wore a white toga during the ceremony.
C1 noun /rɪdʒ/

ridge

Meaning
a long, narrow hilltop, mountain range, or raised strip
Example
We walked along the mountain ridge.
C1 noun ˌflʌk.tʃuˈeɪ.ʃən

fluctuation

Meaning
An irregular rising and falling in number or amount; a variation.
Example
The stock market experiences frequent fluctuation.
C1 noun /ˈɪntərˌpleɪ/

interplay

Meaning
The way in which two or more things have an effect on each other.
Example
The interplay between culture and technology shapes modern life.
C1 noun /ˌdɛsɪˈmeɪʃən/

decimation

Meaning
The act of destroying or killing a large proportion of something.
Example
The decimation of the city left thousands homeless.
C1 adjective /ɪnˈdjʊər.ə.bəl/

Endurable

Meaning
able to be endured; bearable; tolerable
Example
The pain was endurable with proper medication.
C1 noun /ˌtrɛpɪˈdeɪʃən/

trepidation

Meaning
a feeling of fear or anxiety about something that may happen
Example
She opened the letter with some trepidation.
C1 adjective, adverb (informal, vulgar) /ˈfʌkɪŋ/

fucking

Meaning
used for emphasis, often expressing anger or frustration (vulgar slang)
Example
It was a fucking disaster!
C1 verb bɪˈkwiːð

bequeath

Meaning
Leave something to someone in a will; pass down or hand down to the next generation.
Example
The scientist bequeathed his research papers to the university.
C1 adjective /ˈhɛlθfəl/

healthful

Meaning
Promoting good health; beneficial to health.
Example
A healthful diet includes fresh fruits and vegetables.
C1 noun

Longitude

C1 verb /hiːd/

heed

Meaning
to pay attention to; to take notice of
Example
You should heed the teacher's advice.
C1 noun/verb /reɪn/

rein

Meaning
A strap used to control a horse; to control or guide something.
Example
The rider pulled the rein to stop the horse.
C1 noun /ˈprɛsɪpɪs/

precipice

Meaning
A very steep cliff or a situation of great danger.
Example
The hikers stood at the edge of the precipice, gazing into the valley below.
C1 noun /ˈtiːdiəm/

tedium

Meaning
the state of being tedious; monotony or boredom
Example
The tedium of long meetings often drains motivation.
C1 verb /riˈɪtəreɪt/

reiterate

Meaning
To say something again or repeatedly for emphasis or clarity.
Example
The teacher reiterated the importance of honesty.
C1 noun /ɒpˈtɒmɪtrɪst/

optometrist

Meaning
A healthcare professional who examines eyes and prescribes corrective lenses.
Example
The optometrist prescribed new glasses for her.
C1 noun/adjective /ɪˈliːtɪst/

elitist

Meaning
A person who believes that a society should be led by an elite; showing preference for a privileged class.
Example
His elitist attitude made him unpopular among his peers.
C1 noun /ˈnep.ə.tɪz.əm/

Nepotism

Meaning
the practice of favoring relatives or friends in business or politics
Example
The company was accused of nepotism in its hiring practices.
C1 noun /pɜːrl drɒp/

Pearl drop

Meaning
a single pearl used as jewelry, often in earrings or pendants
Example
The elegant pearl drop earrings complemented her outfit perfectly.
C1 verb /ˈstaɪfl/

stifle

Meaning
to prevent or restrain an action, idea, or emotion; to suffocate
Example
She tried to stifle a laugh during the serious meeting.
C1 noun /ˈɪnkjʊˌbeɪtər/

incubator

Meaning
a device or environment that provides suitable conditions for eggs, cells, or infants to develop
Example
The premature baby was placed in an incubator for care.
C1 adjective /ˈspɛktrəl/

spectral

Meaning
Relating to a ghost or specter; ghostly. Also relating to a spectrum.
Example
The old mansion had a spectral atmosphere at night.
C1 adjective /məˈləʊ.di.əs/

Melodious

Meaning
having a pleasant musical sound; tuneful
Example
Her melodious voice captivated the entire audience.
C1 noun /ˈnɒnʃələns/

nonchalance

Meaning
A relaxed and calm state, showing lack of concern or interest.
Example
She answered the tough questions with surprising nonchalance.
C1 verb /əˈlʊər/

allure

Meaning
to attract or tempt someone with something desirable; to entice
Example
The beautiful garden allured visitors from far away.
C1 adjective /vəˈluː.mə.nəs/

voluminous

Meaning
Occupying or containing much space; large in volume, in particular.
Example
The library contained a voluminous collection of books.
C1 noun /ˌdʒʊə.rɪsˈdɪk.ʃən/

Jurisdiction

Meaning
the official power to make legal decisions and judgments; the extent of this power
Example
This case falls under the jurisdiction of the federal court.
C1 noun /saɪˈkoʊsɪs/

psychosis

Meaning
A severe mental disorder in which thought and emotions are impaired, leading to a loss of contact with reality.
Example
The patient was diagnosed with psychosis after experiencing hallucinations.
C1 verb /ɪmˈpɛl/

impel

Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
C1 noun /ədˈhɪə.rəns/

adherence

Meaning
The practice of following or keeping to a rule, standard, or belief.
Example
Adherence to rules is crucial in any organization.
C1 verb /paʊt/

pout

Meaning
to push one's lips forward as an expression of annoyance or sulkiness
Example
The child began to pout when he didn’t get the toy.
C1 noun /ˈɡæmbɪt/

gambit

Meaning
a calculated move or remark intended to gain an advantage, especially in chess or conversation
Example
His opening gambit in the debate caught everyone by surprise.
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 noun /dɪˌnɒmɪˈneɪʃən/

denomination

Meaning
a recognized autonomous branch of the Christian Church; a unit of value or currency
Example
The church belongs to a Protestant denomination.
C1 verb əˈblɪt.ə.reɪt

obliterate

Meaning
To destroy utterly; wipe out completely, to erase or remove something completely.
Example
The storm obliterated entire villages.
C1 noun, adjective /ˈsɒlvənt/

solvent

Meaning
a liquid that dissolves other substances; also means able to pay debts
Example
Acetone is a common solvent used in laboratories.
C1 verb /ˈdɛprɪˌkeɪt/

deprecate

Meaning
to express disapproval of something
Example
The teacher deprecated the use of slang in academic essays.
C1 noun /meɪl treɪn/

Mail train

Meaning
a train that carries mail and postal packages
Example
The mail train departs every evening to deliver letters across the country.
C1 adjective /ˈfaɪ.naɪt/

Finite

Meaning
limited; having bounds or limits; not infinite
Example
Earth has finite natural resources.
C1 adjective /kwɪər/

Queer

Meaning
strange; unusual; peculiar; odd
Example
The old house had a queer atmosphere that made visitors uncomfortable.
C1 adverb /ˌmæθəˈmætɪkli/

mathematically

Meaning
in a way that relates to mathematics; using numbers, formulas, or logical calculation
Example
The problem can be solved mathematically rather than by guesswork.
C1 noun /rɪˈkluːs/

recluse

Meaning
A person who lives alone and avoids other people; someone who lives a solitary life.
Example
The old man lived as a recluse in the mountains.
C1 noun /ɡʌl/

Gull

Meaning
a seabird with webbed feet, long wings, and usually white and gray feathers
Example
The gull swooped down to grab the fish from the water.
C1 noun /ˈseɪɑːns/

seance

Meaning
A meeting where people attempt to communicate with the spirits of the dead.
Example
They held a seance to contact their late grandmother.
C1 adjective /ˌbaɪˈlæt.ər.əl/

bilateral

Meaning
An agreement or relationship between two parties that is mutual, two-sided, or reciprocal.
Example
The two countries signed a bilateral trade agreement.
C1 adjective /læks/

lax

Meaning
Not strict, severe, or careful; negligent or careless.
Example
The security at the airport was surprisingly lax.
C1 adjective /ˈlaɪf.laɪk/

lifelike

Meaning
Very similar to a real person, object, or scene; realistic.
Example
The wax figure was so lifelike that people thought it was a real person.
C1 verb /ˈdʒɒsl/

jostle

Meaning
to push, elbow, or bump against someone roughly, typically in a crowd
Example
The fans jostled each other to get closer to the stage.
C1 noun/verb /dɛnt/

dent

Meaning
a small hollow mark on the surface of something; to make a small hollow mark
Example
The accident left a dent in the car door.
C1 noun/verb /tæk/

tack

Meaning
a small sharp nail; or to change direction in sailing or approach something differently
Example
She used a tack to pin the paper on the wall.
C1 noun /lɪŋˈɡwɪstɪks/

linguistics

Meaning
The scientific study of language and its structure.
Example
She decided to major in linguistics at university.
C1 noun /ˈvʌl.tʃər/

Vulture

Meaning
a large bird of prey that feeds mainly on carrion
Example
The vulture circled overhead, waiting for its prey.
C1 noun /ˈvɜːrtɪˌɡoʊ/

vertigo

Meaning
A sensation of spinning or dizziness, often caused by problems in the inner ear or brain.
Example
She felt a sudden vertigo when she looked down from the tall building.
C1 verb /ˈɪnsjuleɪt/

insulate

Meaning
To protect something by covering it, especially to prevent heat, sound, or electricity from escaping or entering.
Example
The house was insulated to reduce heating costs.
C1 adjective /ɪnˈsʌf.ər.ə.bəl/

insufferable

Meaning
Too extreme to bear; intolerable.
Example
The heat during the summer was insufferable.
C1 noun /kuː/

coup

Meaning
a sudden, decisive action that brings about a change, especially in government
Example
The military staged a coup to overthrow the existing regime.
C1 adjective /ˈɡʌsti/

gusty

Meaning
characterized by strong, sudden bursts of wind
Example
It was a cold, gusty day by the sea.
C1 adjective /kənˈvɜːrdʒənt/

convergent

Meaning
tending to move toward a common point or result
Example
The two rivers have a convergent path before entering the lake.
C1 adjective /tɔːt/

taut

Meaning
stretched or pulled tight; tense
Example
The rope was pulled taut between the two poles.
C1 adjective /ɪnˈfæləbl̩/

infallible

Meaning
incapable of making mistakes or being wrong
Example
Her judgment seemed infallible in matters of finance.
C1 noun /mɪˈlɛniəm/

millennium

Meaning
a period of one thousand years; often used to mark an anniversary
Example
The year 2000 was celebrated as the beginning of a new millennium.
C1 adjective /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
C1 adjective /ˈsɔːsi/

saucy

Meaning
Boldly rude, cheeky, or playfully disrespectful.
Example
The child gave a saucy reply to his teacher.
C1 adjective /ˈrek.wɪ.zɪt/

Requisite

Meaning
made necessary by particular circumstances; required
Example
Good communication skills are requisite for this job.
C1 adjective /ˌmɛtəˈfɔːrɪkəl/

metaphorical

Meaning
Characteristic of or relating to metaphor; figurative rather than literal.
Example
He used metaphorical language to describe his emotions.
C1 adjective /ˈɡæstrɪk/

gastric

Meaning
Relating to the stomach.
Example
She was prescribed medicine for her gastric problems.
C1 adjective /ˈaɪərnˌklæd/

ironclad

Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
C1 noun/verb /rɪˈproʊtʃ/

reproach

Meaning
An expression of disapproval or disappointment; to criticize someone for doing wrong.
Example
She reproached him for arriving late to the meeting.
C1 verb /slɪŋk/

slink

Meaning
to move quietly and secretly, often to avoid being noticed
Example
The cat slunk into the room without making a sound.
C1 noun /kɔːr/

corps

Meaning
a branch of the military or a group organized for a specific purpose
Example
He joined the army corps after graduation.
C1 verb /dɪsˈpruːv/

disprove

Meaning
to show that something is false or wrong
Example
The scientist worked hard to disprove the old theory.
C1 noun /weɪ/

Whey

Meaning
the watery part of milk that separates from the curds when making cheese
Example
Whey protein is popular among athletes and bodybuilders.
C1 noun ˌsɛn.trə.laɪˈzeɪ.ʃən

centralization

Meaning
The concentration of control and decision-making power in a central authority.
Example
Excessive centralization can slow down decision-making.
C1 adjective /ɪˈluː.sɪv/

Illusive

Meaning
deceptive; appearing to exist but not real; misleading
Example
The promise of easy money proved to be illusive and misleading.
C1 adjective /ɪˈrɛvərənt/

irreverent

Meaning
showing a lack of respect for people or things that are usually respected
Example
The comedian’s irreverent jokes offended some of the audience.
C1 verb /ɪˈlæps/

elapse

Meaning
to pass or go by, usually referring to time
Example
Several hours elapsed before he finally returned home.
C1 noun /ˈtrænsfərəns/

transference

Meaning
The act of moving something from one place, person, or situation to another.
Example
The transference of knowledge is essential in education.
C1 adjective /sɑːrˈdɒnɪk/

sardonic

Meaning
Grimly mocking or cynical.
Example
She gave him a sardonic smile after hearing his excuse.
C1 adjective /drəˈkoʊniən/

draconian

Meaning
Extremely harsh and severe, especially laws or rules.
Example
The new regulations were criticized as draconian.
C1 verb /ˌriːˈvaɪ.t̬əl.aɪz/

revitalize

Meaning
To restore energy and effectiveness to something.
Example
The new policies aim to revitalize the economy.
C1 noun /rɪˌtæl.iˈeɪ.ʃən/

Retaliation

Meaning
the action of returning a military attack; counterattack; revenge for an injury or wrong
Example
The country threatened retaliation against any act of aggression.
C1 noun /nuːs/

Noose

Meaning
a loop with a running knot used for hanging; a trap or snare
Example
The cowboy made a noose to catch the wild horse.
C1 verb, noun /ˈbrɪsəl/

bristle

Meaning
to react angrily or defensively; a short stiff hair or fiber
Example
The cat bristled when it saw the dog.
C1 verb /əˈdʒuːdɪˌkeɪt/

adjudicate

Meaning
to make a formal judgment or decision about a problem or dispute
Example
The committee was formed to adjudicate disputes between the parties.
C1 noun /ˌpɜː.mɪˈæbɪlɪti/

permeability

Meaning
The quality or state of being permeable; allowing liquids or gases to pass through.
Example
The permeability of the soil affects water retention.
C1 noun ˈɪm.pɪ.təs

impetus

Meaning
The force or motivation that drives something forward; momentum.
Example
The new policy provided an impetus for economic growth.
C1 noun /ˈlɪŋɡwɪst/

linguist

Meaning
A person skilled in foreign languages or in the scientific study of language.
Example
She is a linguist who speaks six languages fluently.
C1 noun /ɪɡˈzɜːr.ʃən/

exertion

Meaning
Using energy or effort to achieve something.
Example
Excessive exertion can lead to fatigue and burnout.
C1 noun /həˌluː.sɪˈneɪ.ʃən/

Hallucination

Meaning
an experience involving the apparent perception of something not present; a false or distorted perception
Example
The patient experienced visual hallucinations as a side effect of the medication.
C1 noun /əˈpreʃ.ən/

Oppression

Meaning
cruel or unjust treatment or exercise of authority; the state of being subject to harsh treatment
Example
The people fought against political oppression.
C1 noun /ˈsteɪtəs kwoʊ/

status quo

Meaning
The existing state of affairs, especially regarding social or political issues.
Example
The government decided to maintain the status quo until further review.
C1 noun /bruːˈtæləti/

brutality

Meaning
extreme cruelty or violence; savage or inhumane treatment
Example
The brutality of the attack shocked the entire community.
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.