catalyst
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C1 noun ˈkætəlɪst

catalyst

Meaning
A person or thing that precipitates an event or change.
Example
His speech acted as a catalyst for change in the community.
C1 noun ˈoʊʃən əˌsɪdɪfɪˈkeɪʃən

ocean acidification

Meaning
The ongoing decrease in the pH of the Earth's oceans, caused by the absorption of carbon dioxide from the atmosphere.
Example
Ocean acidification is caused by atmospheric CO2 absorption.
C1 adjective /ˈwɪlfəl/

willful

Meaning
Deliberate, intentional, or stubbornly determined to do as one wants.
Example
Her willful disregard for the rules got her into trouble.
C1 noun /ˈsɜːrmən/

sermon

Meaning
A religious discourse delivered by a preacher, often offering moral instruction or spiritual guidance.
Example
The pastor gave a moving sermon about compassion and forgiveness.
C1 noun daɪˈkɒtəmi

dichotomy

Meaning
A division or contrast between two things that are or are represented as being opposed or entirely different.
Example
The dichotomy between tradition and modernity is often debated.
C1 noun /ˈpɛs.tɪ.saɪd ˈrɛz.ɪ.djuː/

pesticide-residue

Meaning
Chemical remnants left over from pesticides used on crops or in soil.
Example
Excess pesticide-residue in food can be harmful to health.
C1 noun /ˈledʒ.ər/

Ledger

Meaning
a book or other collection of financial accounts of a particular type
Example
The accountant updated the company ledger daily.
C1 noun /ˈɡær.ɪ.sən/

garrison

Meaning
A body of troops stationed in a particular location, usually to defend it.
Example
The garrison defended the fortress against the invaders.
C1 adjective /ˈnɒnʃələnt/

nonchalant

Meaning
Appearing calm, casual, and unconcerned.
Example
He gave a nonchalant shrug and walked away.
C1 verb /vaɪ/

vie

Meaning
To compete eagerly with someone in order to do or achieve something.
Example
Several companies are vying for the contract.
C1 noun /ˈpɔːsɪti/

paucity

Meaning
the presence of something in only small or insufficient quantities
Example
The project was delayed due to a paucity of funds.
C1 noun, adjective /ˌæntiˈsɛptɪk/

antiseptic

Meaning
A substance that prevents the growth of disease-causing microorganisms; clean and free from germs.
Example
The nurse applied an antiseptic to the wound.
C1 noun /ˈtraɪæd/

triad

Meaning
a group of three closely related people or things
Example
The project was managed by a triad of experts.
C1 noun /ˈɡrɪd.əl/

Griddle

Meaning
a flat heating surface for cooking food, typically made of metal
Example
She cooked pancakes on the hot griddle.
C1 noun /ˈruːdɪmənt/

rudiment

Meaning
A basic principle, element, or fundamental part of something.
Example
He learned the rudiments of music before joining the band.
C1 noun /mɪkst ɪˈkɒn.ə.mi/

mixed economy

Meaning
An economic system where both government and private sector operate together.
Example
Most countries today follow a mixed economy model.
C1 noun /əˈbɪs/

abyss

Meaning
a deep, immeasurable space, chasm, or void; something seemingly without end
Example
The climbers looked down into the dark abyss below.
C1 adjective /ˈbɔɪstərəs/

boisterous

Meaning
noisy, energetic, and cheerful; rowdy
Example
The children were boisterous during the birthday party.
C1 adjective, noun /ˈkeɪnaɪn/

canine

Meaning
Relating to dogs; also refers to the pointed teeth in humans and animals
Example
The police trained a canine unit for search operations.
C1 noun /njʊˈrɑːlədʒi/

neurology

Meaning
The branch of medicine that deals with disorders of the nervous system.
Example
She specializes in neurology and treats patients with brain diseases.
C1 noun /ˈbraɪ.dəl/

Bridle

Meaning
the headgear used to control a horse, consisting of buckled straps and a bit
Example
The rider adjusted the horse's bridle before mounting for the race.
C1 noun /sɪˈdʌk.ʃən/

Seduction

Meaning
the action of seducing someone; temptation to do something wrong
Example
He fell victim to the seduction of easy money.
C1 adjective /ˈɡrændioʊs/

grandiose

Meaning
Impressive or magnificent in appearance or style, often pretentiously so.
Example
He had grandiose plans of building a futuristic city in the desert.
C1 noun /ˈliːdʒən/

legion

Meaning
a large group of people, especially soldiers; a great number
Example
The Roman army was divided into legions.
C1 verb /ˈkrʌmpəl/

crumple

Meaning
to crush something into folds or wrinkles
Example
He crumpled the paper and threw it in the bin.
C1 noun /ˈiːɡoʊˌtɪzəm/

egotism

Meaning
The practice of talking and thinking about oneself excessively because of an inflated sense of self-importance.
Example
His constant boasting revealed his egotism.
C1 noun /səˈlaɪ.və/

Saliva

Meaning
the watery liquid secreted into the mouth by glands
Example
The dentist asked her to rinse the saliva from her mouth.
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/verb /rɪˈpriːz/

reprise

Meaning
A repetition or return to an earlier theme, role, or action.
Example
The actor reprised his role in the sequel.
C1 noun /ˈhɔːr.nət/

Hornet

Meaning
a large wasp that can sting and is often aggressive
Example
The hornet built its nest under the roof.
C1 verb /snɪər/

sneer

Meaning
to smile or speak in a mocking or contemptuous way
Example
She sneered at his attempt to sing.
C1 noun ˈlɪniɪdʒ

Lineage

Meaning
Direct descent from an ancestor; ancestry or pedigree.
Example
Tracing your lineage can reveal unknown ancestors.
C1 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
C1 adjective /ˈsɛn.sər.i/

sensory

Meaning
Related to the five human senses (sight, hearing, taste, touch, smell).
Example
Sensory feedback enhances the VR experience.
C1 noun /ʌnˈfeɪθfʊlnəs/

unfaithfulness

Meaning
the quality of being disloyal or not faithful; breach of trust or fidelity
Example
His unfaithfulness led to the end of their marriage.
C1 verb /ˈhʌsəl/

hustle

Meaning
to move quickly and energetically; to push or work hard to achieve something
Example
She had to hustle to finish the project on time.
C1 noun /ˌmɔːrəˈtɔːriəm/

moratorium

Meaning
A temporary suspension or delay of an activity, law, or obligation.
Example
The government announced a moratorium on new mining licenses.
C1 noun /ˈʌp.tɜːn/

upturn

Meaning
An improvement or upward trend in a situation, especially in business or economy.
Example
The company experienced an upturn in sales last quarter.
C1 verb /ˈkəʊ.dɪ.faɪ/

codify

Meaning
to arrange laws, rules, or ideas into a clear and systematic code
Example
The committee worked to codify the existing laws.
C1 adjective /ˈsʌlən/

sullen

Meaning
bad-tempered and gloomy; silently resentful
Example
She gave him a sullen look and walked away.
C1 noun /ˈtrævɪsti/

travesty

Meaning
A false, absurd, or distorted representation of something.
Example
The trial was a travesty of justice.
C1 verb /ɪnˈfrɪndʒ/

infringe

Meaning
To actively break the terms of a law, agreement, or right.
Example
Copying this software without permission will infringe copyright laws.
C1 verb /ˌriːɪmˈbɜːrs/

reimburse

Meaning
to pay back money to someone who has spent it or lost it
Example
The company reimbursed him for travel expenses.
C1 noun /ˈmɒn.ɑːk/

Monarch

Meaning
a sovereign ruler, especially a king or queen
Example
The monarch addressed the nation on television.
C1 noun prəˈfaʊnd ɪˈnɪʃətɪv

profound initiative

Meaning
A deep, meaningful, and significant action or program designed to create change.
Example
A profound initiative can create sustainable changes.
C1 noun /ˌriː.dɪs.trɪˈbjuː.ʃən/

redistribution

Meaning
The sharing of wealth or resources more equally among society.
Example
The government introduced a redistribution policy to reduce inequality.
C1 noun /ˈsuːdənɪm/

pseudonym

Meaning
a fictitious name used by an author instead of their real name
Example
Mark Twain was the pseudonym of Samuel Clemens.
C1 adjective /əˈblaɪdʒɪŋ/

obliging

Meaning
Willing to help or do favors; accommodating.
Example
The staff at the hotel were very obliging and friendly.
C1 noun kɒɡˈnɪʃ.ən

cognition

Meaning
The mental action or process of acquiring knowledge and understanding through thought, experience, and the senses.
Example
Cognition plays a key role in learning.
C1 noun /əˈtrɑːsəti/

atrocity

Meaning
an extremely cruel or violent act, often involving physical violence
Example
The world condemned the atrocity committed against civilians.
C1 adjective /kənˈtɛmptəbl/

contemptible

Meaning
deserving of contempt; despicable
Example
His deceitful actions were truly contemptible.
C1 noun, verb /ˈliːvər/ or /ˈlɛvər/

lever

Meaning
a rigid bar used to move or lift heavy objects; to move something using leverage.
Example
He used a lever to lift the heavy stone.
C1 noun /ˈpɔːr.kjə.paɪn/

Porcupine

Meaning
a large rodent with defensive spines or quills on its body
Example
The porcupine raised its quills when threatened.
C1 noun, verb /dɪsˈɑːnər/

dishonor

Meaning
a state of shame or loss of respect; to bring shame upon someone or something
Example
The soldier felt he had brought dishonor to his family.
C1 noun /mæɡˈnɪfɪsəns/

magnificence

Meaning
splendor, grandeur, or impressive beauty
Example
The magnificence of the palace left everyone speechless.
C1 verb /ɪmˈbɛd/

imbed

Meaning
To fix firmly or deeply in a surrounding mass.
Example
The journalist imbedded himself with the troops to report firsthand.
C1 adjective ləˈθɑːrdʒɪk

lethargic

Meaning
Being inactive due to lack of physical or mental energy
Example
After a heavy meal, he felt lethargic and sleepy.
C1 noun /ˌæn.əˈnɪm.ə.ti/

anonymity

Meaning
The state of being anonymous; having one's identity kept secret or unknown.
Example
Online anonymity protects users from cyber threats.
C1 noun /dɪˈspɜːrʒən/

dispersion

Meaning
The action or process of distributing things or people over a wide area.
Example
The dispersion of seeds by the wind helps plants reproduce.
C1 verb /skɒf/

scoff

Meaning
to speak about something in a mocking or dismissive way
Example
He scoffed at the idea of moving abroad.
C1 noun /ˌpɜːrsɪˈkjuːʃn/

persecution

Meaning
the act of treating someone cruelly or unfairly because of their religion, race, or beliefs
Example
The persecution of minorities has been condemned worldwide.
C1 noun /klaʊt/

clout

Meaning
influence or power, especially in politics or business
Example
The businessman has a lot of political clout.
C1 noun /ɪmˈpɜːrtɪnəns/

impertinence

Meaning
lack of respect; rudeness
Example
The teacher was shocked by the student's impertinence.
C1 verb /ˈkæptɪveɪt/

captivate

Meaning
to attract and hold the interest of; to charm or fascinate
Example
Her beautiful voice captivated the audience.
C1 noun ˌmɪt.ɪˈɡeɪ.ʃən

mitigation

Meaning
The action of reducing the severity, seriousness, or painfulness of something.
Example
Mitigation of climate change requires collective effort.
C1 adjective /ˈhɛdˌstrɔŋ/

headstrong

Meaning
Determined to do what one wants, even if it is not sensible.
Example
The headstrong child refused to listen to anyone.
C1 noun /krəˈnɒlədʒi/

chronology

Meaning
The arrangement of events or dates in the order of their occurrence.
Example
The chronology of the dynasty was carefully studied by historians.
C1 verb /wɑːft/

waft

Meaning
to move gently through the air, carried by a breeze
Example
The smell of fresh bread wafted through the kitchen.
C1 verb /ˈræn.də.maɪz/

randomize

Meaning
To make something happen in a random order or manner.
Example
The software can randomize the order of questions.
C1 verb /bʌdʒ/

budge

Meaning
To move slightly; to change one’s opinion or position.
Example
Despite the pressure, he refused to budge from his decision.
C1 noun /ˈdɪm.pəl/

Dimple

Meaning
a small depression in the flesh, either one that exists permanently or one that forms when smiling
Example
Her charming dimples appeared whenever she smiled at the children.
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 noun /prəˈpraɪəti/

propriety

Meaning
Conformity to accepted standards of behavior or morality.
Example
He always behaved with the utmost propriety in public.
C1 adjective /ˈkɔː.stɪk/

caustic

Meaning
able to burn or corrode by chemical action; severely sarcastic
Example
Her caustic remarks hurt his feelings.
C1 noun /ˈtʃæs.tɪ.ti/

Chastity

Meaning
the practice of refraining from extramarital or premarital sexual relations; sexual purity
Example
Many religious traditions value chastity as a virtue of moral purity.
C1 adjective /ˈbuːzi/

boozy

Meaning
containing or involving a lot of alcohol; slightly drunk from alcohol
Example
The party became boozy as the night went on.
C1 verb /səˈkʌm/

succumb

Meaning
To give in to pressure, temptation, or illness; to yield or fail to resist.
Example
He finally succumbed to his illness after a long struggle.
C1 adjective /ɪnˈvæljʊəbl/

invaluable

Meaning
Extremely useful or indispensable.
Example
Her advice proved invaluable to my success.
C1 verb /ɪnˈkɜːr/

incur

Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
C1 noun /ˈsɪtəˌdɛl/

citadel

Meaning
A fortress protecting or dominating a city.
Example
The ancient citadel stood guard over the town for centuries.
C1 verb প্রিসিপিটেট

precipitate

Meaning
To fall from the sky as rain, snow, or other forms of water.
Example
Vapor precipitates as rain in warmer climates.
C1 verb /əˈmæs/

amass

Meaning
to gather together or accumulate over a period of time
Example
He managed to amass a fortune through wise investments.
C1 adjective /ˈpɛnsɪv/

pensive

Meaning
Engaged in deep or serious thought.
Example
She looked pensive as she stared out of the window.
C1 noun ˌɛkstərˈnælɪtiz

externalities

Meaning
A side effect or consequence of an industrial or commercial activity.
Example
Pollution is a negative externality of industrialization.
C1 adjective /ˌɪnkənˈkluːsɪv/

inconclusive

Meaning
Not leading to a definite result or decision.
Example
The investigation remained inconclusive due to a lack of evidence.
C1 noun /ˈmɛrɪɡoʊld/

Marigold

Meaning
a bright orange or yellow flower of the daisy family, often used in gardens and ceremonies
Example
The vibrant marigold flowers added a splash of color to the festival decorations.
C1 adjective /ˈdɛkədənt/

decadent

Meaning
Characterized by or reflecting a state of moral or cultural decline; excessively self-indulgent.
Example
The party was filled with decadent luxury and excess.
C1 noun ˌdɪm.ɪˈnjuː.ʃən

diminution

Meaning
A reduction in the size, extent, or importance of something; decrease.
Example
There has been a diminution in air pollution.
C1 verb /dɪsˈsætɪsfaɪ/

dissatisfy

Meaning
to fail to please or meet expectations; to make someone unhappy
Example
The poor service dissatisfies many customers.
C1 noun /kɔːrs flaʊər/

Course flour

Meaning
coarsely ground flour with larger particles, typically used for baking bread
Example
She used course flour to make homemade bread with a rustic texture.
C1 verb /wɔːrp/

warp

Meaning
To twist or bend out of shape, often due to heat or moisture.
Example
The wooden door warped in the summer heat.
C1 noun /fiˈæs.koʊ/

fiasco

Meaning
a complete failure, especially a ludicrous or humiliating one
Example
The event turned into a complete fiasco due to poor planning.
C1 noun ˌdʒɛriˈætrɪk səˈsaɪəti

geriatric society

Meaning
A society or community where elderly people make up a large proportion of the population
Example
A geriatric society demands specialized healthcare systems.
C1 noun /ˈmɛləˌdrɑːmə/

melodrama

Meaning
A dramatic piece with exaggerated characters and exciting events intended to appeal to the emotions.
Example
The movie was criticized for its excessive melodrama.
C1 verb /ˈpɪlɪdʒ/

pillage

Meaning
to rob or plunder a place, especially during war
Example
The invading army pillaged the village and took all valuables.
C1 noun /ˈdʒuː.bɪ.liː/

Jubilee

Meaning
a special anniversary celebration, especially the 25th, 50th, or 60th anniversary of an important event
Example
The school celebrated its golden jubilee with a grand ceremony.
C1 verb ˌæs.ɚˈteɪn

ascertain

Meaning
To find out or discover something with certainty; to verify.
Example
The police tried to ascertain the cause of the accident.
C1 adjective /rɪˈtaɪərɪŋ/

retiring

Meaning
Shy and reserved; avoiding social contact.
Example
She is a quiet, retiring woman who avoids attention.
C1 adjective /əˈtrəʊ.ʃəs/

Atrocious

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

unscathed

Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
C1 noun /woʊ/

woe

Meaning
great sorrow, distress, or trouble
Example
Her heart was filled with woe after hearing the sad news.
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 verb /ɡreɪt/

grate

Meaning
to shred food into small pieces using a grater; to irritate or annoy
Example
She grated the cheese for the pasta dish.
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 /ˈsʌltri/

sultry

Meaning
Uncomfortably hot and humid; also describes someone attractive in a passionate or sensual way.
Example
The sultry weather made it hard to focus on work.
C1 adjective /ˈwoʊ.fəl/

woeful

Meaning
full of woe; very sad or miserable; also used to mean very bad or deplorable
Example
He gave me a woeful look when he lost the match.
C1 adjective /ˈɔːrdɪnəl/

ordinal

Meaning
Relating to the order or position of something in a sequence (first, second, third, etc.).
Example
The ordinal number 'third' indicates position in a sequence.
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 adjective əˈblɪv.i.əs

oblivious

Meaning
Being completely unaware of surrounding events.
Example
He was oblivious to the noise around him while reading.
C1 noun /ˈtɜːrbjələns/

turbulence

Meaning
Violent or unsteady movement of air, water, or some other fluid; disorder or conflict.
Example
The plane experienced severe turbulence during the flight.
C1 noun /ˈɪnsɪdəns/

incidence

Meaning
the occurrence, rate, or frequency of something
Example
The incidence of road accidents has decreased this year.
C1 noun /ˈbaɪoʊˌsfɪr/

Biosphere

Meaning
the regions of the surface and atmosphere of the earth occupied by living organisms
Example
Climate change is affecting the entire biosphere.
C1 verb /riːˈpeɪ.tri.eɪt/

repatriate

Meaning
To return someone to their own country, often after war or imprisonment.
Example
The government worked to repatriate the refugees safely.
C1 verb /ˌɪnstɪˈtjuːʃənəlaɪz/

institutionalize

Meaning
to establish something as a formal institution, custom, or practice
Example
The government seeks to institutionalize environmental protection.
C1 /skwɒt/

squat

Meaning
to crouch or sit with knees bent and body close to the ground
Example
He squatted down to tie his shoes.
C1 noun /ˈnjuːɑːns/

nuance

Meaning
A subtle difference in shade of meaning, appearance, or sound.
Example
He noticed the subtle nuance in her expression.
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 adjective /ɪnˈhɪbɪtɪd/

inhibited

Meaning
Unable to act in a relaxed and natural way, especially due to self-consciousness or restraint.
Example
He was too inhibited to express his true feelings.
C1 noun /ˈhaɪdəweɪ/

hideaway

Meaning
A place used as a retreat or a place to hide.
Example
The cabin in the woods was their secret hideaway.
C1 adjective /dɪˈɡreɪdɪd/

degraded

Meaning
Reduced in quality, dignity, or condition.
Example
The villagers were forced to live in degraded conditions.