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C1 adjective /ˈtrænziənt/

Transient

Meaning
lasting for only a short time; temporary
Example
The beauty of spring flowers is transient.
C1 noun /ɪɡˈzɛkjətər/

executor

Meaning
A person appointed to carry out the terms of someone's will after their death.
Example
The executor managed the estate according to the deceased’s wishes.
C1 noun /ˌoʊvərprəˈdʌkʃən/

overproduction

Meaning
The act of producing more of something than is needed or can be consumed.
Example
The economic crisis was caused by the overproduction of goods.
C1 noun /ˈɪntrɪkəsi/

intricacy

Meaning
the quality of being very detailed or complicated
Example
The intricacy of the design impressed everyone.
C1 noun ˌpriː.dɪs.pəˈzɪʃ.ən

predisposition

Meaning
A natural tendency or inclination toward a particular behavior or condition.
Example
Genetic factors can influence a person's predisposition to diseases.
C1 noun ˌɒb.səˈlɛs.əns

obsolescence

Meaning
The process of becoming obsolete or outdated and no longer used.
Example
The rapid advancement of technology leads to the obsolescence of old devices.
C1 adjective /stiːpt/

steeped

Meaning
Completely surrounded by or filled with a particular quality, influence, or experience.
Example
The town is steeped in history and tradition.
C1 verb /ɪnˈfleɪt/

inflate

Meaning
to fill with air or gas so it expands; to increase excessively or artificially
Example
The mechanic inflated the tire to the correct pressure.
C1 adjective /ˈɛntərˌpraɪzɪŋ/

enterprising

Meaning
showing initiative and resourcefulness; willing to take risks to achieve success
Example
She is an enterprising young entrepreneur.
C1 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
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 /ˈpiːs.ə.bəl/

Peaceable

Meaning
peaceful; inclined to avoid conflict
Example
The peaceable protest ended without any violence.
C1 noun ˈkɑːr.bən ˌsiː.kwəˈstreɪ.ʃən

carbon sequestration

Meaning
The process of capture and long-term storage of atmospheric carbon dioxide to mitigate or defer global warming.
Example
Forests play a key role in carbon sequestration.
C1 verb /plʌm/

plumb

Meaning
to measure the depth of water or examine closely
Example
They used a line to plumb the depth of the lake.
C1 noun /ˈtæl.i/

Tally

Meaning
a count or record of a number or amount; a score or total
Example
Keep a tally of how many books you read this month.
C1 noun /ɪɡˌzɪl.əˈreɪ.ʃən/

exhilaration

Meaning
A feeling of excitement, happiness, or elation.
Example
The feeling of exhilaration after a roller-coaster ride is amazing.
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 /ˈperɪʃəbəl/

Perishable

Meaning
liable to decay quickly; short-lived
Example
Store perishable foods in the refrigerator.
C1 noun /kɒzˈmɒlədʒi/

cosmology

Meaning
the science of the origin and development of the universe
Example
She studied cosmology to understand the origins of the universe.
C1 noun /ˈplʌn.dər.ər/

Plunderer

Meaning
a person who steals goods, especially during war or civil disorder
Example
The plunderers ransacked the village after the battle.
C1 adverb /ˈɪnwərdli/

inwardly

Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
C1 adjective /ˈskwɒlɪd/

squalid

Meaning
extremely dirty and unpleasant, often due to poverty or neglect
Example
He lived in a squalid room with broken furniture.
C1 verb /ʌnˈmɑːsk/

unmask

Meaning
to remove a mask or covering; to reveal the true identity, nature, or intentions of someone or something
Example
The investigation helped unmask the real culprit behind the crime.
C1 verb /əbˈdʌkt/

abduct

Meaning
to take someone away illegally by force or deception
Example
The criminal tried to abduct the child in broad daylight.
C1 verb koʊˈɜrs

coerce

Meaning
To force someone to do something against their will using threats or intimidation.
Example
The manager tried to coerce the employees into working overtime.
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 /ˈpɒp.i siːdz/

Poppy Seeds

Meaning
tiny round seeds from the poppy plant used as a spice or garnish in cooking
Example
Poppy seeds are sprinkled on top of breads and used in Bengali curries.
C1 adjective /pəˈrɪʒən/

parisian

Meaning
relating to Paris or its people
Example
She wore a Parisian style dress at the party.
C1 noun /ˈtriːzən/

Treason

Meaning
the crime of betraying one's country, especially by attempting to kill or overthrow the sovereign or government
Example
He was accused of treason against the state.
C1 verb /ɪnˈtʃænt/

enchant

Meaning
to delight or charm greatly; to cast a spell over
Example
The storyteller enchanted the children with his tales.
C1 noun ˌmek.ə.naɪˈzeɪ.ʃən

mechanization

Meaning
The process of introducing machines or replacing manual labor with machines.
Example
Mechanization has revolutionized agriculture.
C1 noun /ˌædəˈreɪʃən/

adoration

Meaning
deep love and respect; worship
Example
The fans showed their adoration for the singer.
C1 adjective /dɪˈɡreɪdɪd/

degraded

Meaning
Reduced in quality, dignity, or condition.
Example
The villagers were forced to live in degraded conditions.
C1 adjective /ɪmˈpæsɪv/

impassive

Meaning
Not showing or feeling emotion; expressionless.
Example
Despite the shocking news, she remained impassive.
C1 noun /ɪnˈvɜːrʒən/

inversion

Meaning
A reversal of the normal order, position, or relationship.
Example
In poetry, inversion is often used to create emphasis.
C1 noun /buːn/

boon

Meaning
A thing that is helpful or beneficial.
Example
The internet is a boon to modern education.
C1 verb /snɪp/

snip

Meaning
to cut something quickly with scissors or a sharp tool
Example
She snipped the loose thread from her dress.
C1 noun /ˈmeɪniə/

Mania

Meaning
Mental illness marked by periods of great excitement; extreme enthusiasm
Example
She had a mania for collecting vintage postcards from around the world.
C1 adjective /ˈtep.ɪd/

Tepid

Meaning
only slightly warm; lukewarm; showing little enthusiasm
Example
The tea was tepid and unappetizing.
C1 noun /ˈɛər.luːm/

heirloom

Meaning
a valuable object that has belonged to a family for several generations
Example
The ring is a family heirloom passed down from her grandmother.
C1 adjective /kənˈdʒenɪtl/

congenital

Meaning
existing from birth, usually describing a disease or condition
Example
The child was born with a congenital heart defect.
C1 noun /ˈiːdɪkt/

edict

Meaning
An official order, proclamation, or decree issued by an authority.
Example
The king issued an edict banning smoking in public places.
C1 adjective /ˈsæv.i/

savvy

Meaning
Having practical knowledge and the ability to make good judgments.
Example
She is a tech-savvy entrepreneur.
C1 noun /frəˈdʒɪl.ɪ.ti/

fragility

Meaning
The quality of being fragile; delicateness.
Example
The cornea's fragility increases with rubbing.
C1 adjective məˈdʒes.tɪk

Majestic

Meaning
Having impressive beauty, dignity, or grandeur; regal and stately in appearance.
Example
The majestic Himalayas stand tall against the sky.
C1 noun /kənˈfaɪnmənt/

confinement

Meaning
the state of being confined or restricted
Example
The prisoner endured years of confinement.
C1 noun /læps/

Lapse

Meaning
a temporary failure of concentration, memory, or judgment; the termination of a right or privilege
Example
There was a brief lapse in security that allowed the intruder to enter the building.
C1 adjective /ɪnˈvæljʊəbl/

invaluable

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

unnaturally

Meaning
in a way that is not natural or normal; excessively or strangely
Example
He smiled unnaturally, making everyone feel uncomfortable.
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 noun /hɪˈpɑː.krə.si/

Hypocrisy

Meaning
the practice of claiming to have moral standards that one does not actually possess; insincerity
Example
His hypocrisy was exposed when he criticized others for the same mistakes he had made.
C1 noun /ˈmeɪsən/

mason

Meaning
a person skilled in building with stone, brick, or concrete
Example
The mason carefully laid the bricks for the new house.
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 adjective /ʌnˈtaɪərɪŋ/

Untiring

Meaning
continuing without stopping; persistent; tireless
Example
Her untiring efforts finally led to success.
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 adjective /ləˈbɔːr.i.əs/

laborious

Meaning
requiring considerable effort and time; difficult and hard-working
Example
Writing the long report was a laborious task.
C1 noun /ˈtem.pər.ə.mənt/

Temperament

Meaning
a person's natural disposition or mood; characteristic behavior patterns
Example
She has a calm temperament that helps her handle stress well.
C1 noun /rɪˈspɒndənt/

respondent

Meaning
A person who replies to something, especially in a survey or legal case
Example
The survey had over 1,000 respondents.
C1 adjective /dɪˈfʌŋkt/

defunct

Meaning
No longer existing, operating, or functioning.
Example
The company became defunct after the financial crisis.
C1 noun /ˈdʒɛntri/

gentry

Meaning
People of good social position, usually of high birth or wealthy landowners
Example
The gentry of the town gathered for the annual ball.
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 adjective /wɪðˈdrɔːn/

withdrawn

Meaning
quiet and shy; not wanting to talk to others
Example
After the incident, he became withdrawn and avoided his friends.
C1 adjective /rɪˈvɜː.sə.bəl/

Reversible

Meaning
able to be turned the other way around; able to be undone or changed back
Example
This jacket is reversible and can be worn on both sides.
C1 verb /fɔːrˈʃædoʊ/

foreshadow

Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
C1 adjective /rɪˈtɜː.nə.bəl/

Returnable

Meaning
able to be returned or given back
Example
The bottle is returnable for a deposit refund.
C1 adjective /ˈdɑːsəl/ or /ˈdəʊsaɪl/

docile

Meaning
easily managed, taught, or controlled; submissive
Example
The docile puppy quickly learned new tricks.
C1 noun ˌmiː.diˈɒk.rə.ti

mediocrity

Meaning
Being average or ordinary, not particularly good.
Example
He refused to settle for mediocrity and aimed for greatness.
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 /mɪˈrɑːʒ/

Mirage

Meaning
An optical illusion caused by atmospheric conditions, especially in deserts
Example
The travelers saw a mirage of water in the desert.
C1 noun, verb /raʊt/

rout

Meaning
A decisive defeat; to defeat completely.
Example
The army routed the enemy forces in the battle.
C1 noun /fiːt/

feat

Meaning
an achievement that requires great courage, skill, or strength
Example
Climbing Mount Everest was a remarkable feat.
C1 adjective /ˈpɜːrmiəbl̩/

permeable

Meaning
allowing liquids or gases to pass through
Example
The soil in this area is very permeable to water.
C1 noun /ˈɑːrdər/

ardor

Meaning
Great enthusiasm or passion.
Example
She spoke with ardor about her new project.
C1 adjective dʒuːˈdɪʃ.əs

judicious

Meaning
Having, showing, or done with good judgment or sense; wise and careful.
Example
A judicious decision can prevent future problems.
C1 noun /dɪˈfjuːʒən/

diffusion

Meaning
the spreading of something more widely or the movement of particles from high to low concentration
Example
The diffusion of information on social media is rapid.
C1 noun ˈrɛp.ə.twɑːr

repertoire

Meaning
A stock of plays, dances, or pieces that a company or a performer knows or is prepared to perform.
Example
The actor's repertoire includes both comedy and drama.
C1 verb /ɪˈvɪkt/

evict

Meaning
To expel someone from a property, usually by legal process.
Example
The landlord decided to evict the tenants for not paying rent.
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 verb /prəˈlɪf.ə.reɪt/

proliferate

Meaning
To increase rapidly in numbers; to grow or spread quickly and extensively.
Example
Startups tend to proliferate in a thriving economy.
C1 noun ˌsɛlf.rɪˈstreɪnt

self-restraint

Meaning
The practice of restraining oneself from indulging in something, typically an impulse or desire.
Example
Practicing self-restraint helps in avoiding impulsive decisions.
C1 verb /ˌmɪsˈriːd/

misread

Meaning
to read something incorrectly or interpret wrongly
Example
He misread the instructions and built the shelf incorrectly.
C1 noun /ˈθʌroʊˌfɛr/

thoroughfare

Meaning
a main road or public highway that goes through a place
Example
The new mall is located along the main thoroughfare.
C1 noun/adjective /kənˈfɛdərət/

confederate

Meaning
a person, group, or state joined in an alliance or union; relating to a confederacy
Example
The confederate soldiers fought bravely in the war.
C1 adjective /ˈpæl.ə.tə.bəl/

palatable

Meaning
pleasant or acceptable to the taste, mind, or feelings
Example
The meal was simple but quite palatable.
C1 adjective /ɒˈstɛnsəbl/

ostensible

Meaning
stated or appearing to be true, but not necessarily so
Example
His ostensible reason for leaving was illness, but many doubted it.
C1 noun ˌmɛməraɪˈzeɪʃən

memorization

Meaning
The process of learning or committing something to memory
Example
Memorization of important information is crucial for exams.
C1 noun /ˈsɛntrɪˌfjuːdʒ/

centrifuge

Meaning
A machine that spins substances at high speed to separate different components.
Example
The lab technician used a centrifuge to separate the blood cells from the plasma.
C1 adjective /ˈpɪt.i.ə.bəl/

pitiable

Meaning
deserving sympathy or compassion
Example
The stray dog looked pitiable in the rain.
C1 verb /piːv/

peeve

Meaning
To annoy or irritate someone.
Example
His constant interruptions really peeve me.
C1 adjective ˌɪn.trəˈspek.tɪv

introspective

Meaning
Characterized by or given to introspection; examining one's own thoughts and feelings.
Example
Writers tend to be highly introspective individuals.
C1 adjective /stɔːntʃ/

staunch

Meaning
Loyal, committed, and firm in support.
Example
She is a staunch supporter of environmental protection.
C1 verb /lɜːrk/

lurk

Meaning
to remain hidden so as to wait for an opportunity to attack or observe
Example
A stranger lurked in the shadows.
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 adjective /ˈpen.ɪ.ləs/

Penniless

Meaning
having no money; extremely poor; completely without funds
Example
After losing his job, he became penniless.
C1 verb /ˈræŋɡl̩/

wrangle

Meaning
to argue or dispute noisily or angrily
Example
The two neighbors wrangled over the property line for hours.
C1 adjective /ˈswoʊlən/

swollen

Meaning
Enlarged or puffed up, usually due to injury, inflammation, or fluid accumulation
Example
Her ankle was swollen after she twisted it during the hike.
C1 noun /ˈjeloʊ oʊliˈændər/

Yellow oleander

Meaning
a tropical flowering shrub with bright yellow flowers; also known as lucky nut
Example
The yellow oleander blooms throughout the year in warm climates.
C1 adjective /ˈpɔɪ.njənt/

poignant

Meaning
evoking a keen sense of sadness or regret; deeply touching
Example
The movie's ending was so poignant that many in the audience were moved to tears.
C1 adjective /ˈlʌʃəs/

luscious

Meaning
deliciously sweet or rich; highly appealing to the senses
Example
She served a luscious chocolate cake.
C1 noun məˈriːn ˈsɜː.veɪ

marine survey

Meaning
A systematic examination of the sea, seabed, and underwater features for the purpose of making maps or gathering other information.
Example
The marine survey identified the ideal cable routes.
C1 verb /kənˈfleɪt/

conflate

Meaning
To combine two or more things, often confusingly, into one.
Example
The article tends to conflate facts with opinions.
C1 noun /ˈwɪtʃ.krɑːft/

witchcraft

Meaning
the practice of magical skills, spells, and abilities
Example
In old times, many people believed in witchcraft.
C1 verb /ˌdɪsəˈsɛmbəl/

disassemble

Meaning
To take apart something into its separate pieces.
Example
He had to disassemble the computer to repair it.
C1 verb /piːk/

pique

Meaning
to stimulate interest or curiosity; to arouse resentment or anger
Example
Her remarks piqued his curiosity about the secret project.
C1 adjective /kənˈteɪ.dʒəs/

Contagious

Meaning
likely to spread to and affect others; infectious
Example
Her laughter is contagious and makes everyone smile.
C1 verb /ˈɒs.ɪ.leɪt/

oscillate

Meaning
To swing or move back and forth between two points or states
Example
The stock market tends to oscillate during uncertain times.
C1 noun /juːnəˈnɪməti/

Unanimity

Meaning
complete agreement among all members of a group
Example
The committee reached unanimity on the new policy.
C1 adjective /ɪnˈkɒmp(ə)rəbl/

incomparable

Meaning
Without an equal in quality or excellence; matchless.
Example
The view from the mountain was incomparable.
C1 adjective /əˈblɪɡ.ə.tɔː.ri/

obligatory

Meaning
Required by a legal, moral, or other rule; compulsory.
Example
Wearing a seatbelt is obligatory in most countries.
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 noun /ˈtreɪ.ki.ə/

Trachea

Meaning
the tube that carries air from the throat to the lungs; windpipe
Example
The trachea is protected by cartilage rings that keep it open.
C1 adjective /ˈtɒp.məʊst/

Topmost

Meaning
highest in position or rank
Example
The flag was placed on the topmost branch of the tree.
C1 noun /bɒmˈbɑːrdmənt/

bombardment

Meaning
a continuous attack with bombs or other projectiles
Example
The city endured a heavy bombardment during the war.
C1 adjective /drəˈkoʊniən/

draconian

Meaning
Extremely harsh and severe, especially laws or rules.
Example
The new regulations were criticized as draconian.
C1 noun /ɪnˈtruː.ʒən/

intrusion

Meaning
Unauthorized entry into a system or place without permission
Example
The company detected an intrusion in its server.
C1 noun /ˌhaɪ.roʊˈɡlɪf.ɪks/

hieroglyphics

Meaning
a system of writing using pictures or symbols, used especially by ancient Egyptians
Example
The tomb walls were covered with Egyptian hieroglyphics.
C1 noun/verb /smʌdʒ/

smudge

Meaning
a dirty mark or smear; to make something dirty or unclear by rubbing or touching
Example
She accidentally smudged her lipstick on the napkin.
C1 verb/noun /ˈsɒldər/

solder

Meaning
To join metal parts together by melting and putting a filler metal into the joint
Example
He soldered the broken wires back together.
C1 adjective /ˌɪnækˈsɛsəbl/

inaccessible

Meaning
unable to be reached, entered, or understood
Example
The remote village is almost inaccessible during the rainy season.
C1 adjective /ˌmiː.diˈoʊ.kər/

mediocre

Meaning
Of only average quality; not very good.
Example
The movie was entertaining but overall mediocre.
C1 noun /ˈmɒnəʊˌkʌltʃər/

monoculture

Meaning
The agricultural practice of growing only one type of crop over a large area and for many consecutive years, which can lead to increased vulnerability to pests and diseases.
Example
Monoculture can lead to soil depletion and increased pest vulnerability.