corrosion
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C1 noun kəˈrəʊ.ʒən

corrosion

Meaning
The gradual destruction of materials by chemical or electrochemical reaction, especially of metals by oxidation.
Example
Corrosion in pipes leads to leakage.
C1 adjective /ˌwɛl tə ˈduː/

well-to-do

Meaning
Prosperous, wealthy, or financially comfortable.
Example
They belong to a well-to-do family in the city.
C1 adjective /səˈtɪrɪk/

satiric

Meaning
Relating to or using satire.
Example
The novel takes a satiric view of urban life.
C1 noun /ˈwʊd.ən ˈsæn.dəl/

Wooden sandal

Meaning
a type of footwear made of wood, typically worn as traditional shoes
Example
She wore wooden sandals to the traditional ceremony.
C1 noun /pəˈpaɪrəs/

papyrus

Meaning
An ancient writing material made from the pith of the papyrus plant; also refers to the plant itself.
Example
The ancient scroll was written on papyrus.
C1 adjective /ˈpɒp.jʊ.ləs/

Populous

Meaning
having a large population; densely populated; crowded with people
Example
China is the most populous country in the world.
C1 verb /ˈrætɪfaɪ/

ratify

Meaning
to approve or confirm something officially, usually by law or formal consent
Example
The government ratified the trade agreement.
C1 noun /plaɪt/

Plight

Meaning
a dangerous, difficult, or unfortunate situation
Example
The refugees were in a desperate plight.
C1 noun /sɪˈtɑːr/

Sitar

Meaning
a traditional Indian stringed musical instrument with a long neck and resonating body
Example
The sitar creates beautiful ragas in Indian classical music.
C1 noun ˈpær.ə.daɪm

paradigm

Meaning
A typical example or pattern of something; a model or framework for understanding or approaching something.
Example
The paradigm of education is changing with digital technology.
C1 noun /bɪz/

Biz

Meaning
business (informal); commercial enterprise or activity
Example
He's been in the restaurant biz for twenty years.
C1 adjective /ˈhæk.nid/

hackneyed

Meaning
Used too often and therefore lacking originality or freshness.
Example
The speech was filled with hackneyed phrases that failed to inspire the audience.
C1 adjective /ɪɡˈzæspəˌreɪtɪd/

exasperated

Meaning
greatly annoyed or irritated
Example
She gave him an exasperated look after his repeated mistakes.
C1 verb /broʊtʃ/

broach

Meaning
to bring up a subject for discussion
Example
She decided to broach the topic of salary with her manager.
C1 noun /ˈɛmbləm/

emblem

Meaning
A symbolic object, design, or figure representing an idea, group, or identity.
Example
The dove is an emblem of peace.
C1 verb /dɪˈsɛkt/

dissect

Meaning
to cut apart an animal, plant, or other organism to study its internal parts; to analyze something in detail
Example
In biology class, students had to dissect a frog to learn about its anatomy.
C1 noun /kriːd/

creed

Meaning
A system of religious or spiritual beliefs or a guiding principle.
Example
Freedom of speech is part of his personal creed.
C1 adjective /ˈtækt.ləs/

tactless

Meaning
showing a lack of sensitivity in dealing with others
Example
His tactless remark embarrassed everyone at the meeting.
C1 adjective /rɪˈsɜːrdʒənt/

resurgent

Meaning
Becoming strong, active, or popular again.
Example
The resurgent economy gave hope to many businesses.
C1 noun ˈredʒ.ɪ.strɑːr

registrar

Meaning
An official responsible for keeping records or registers.
Example
The registrar oversees all administrative tasks.
C1 noun /ˈkleɪmənt/

claimant

Meaning
a person who makes a claim, especially in a legal or financial context
Example
The claimant filed for compensation after the accident.
C1 adjective /ˈpælpəbl̩/

palpable

Meaning
easily perceived or felt; so intense as to seem almost tangible
Example
There was a palpable sense of excitement in the room.
C1 adjective /ˈpleɪntɪv/

plaintive

Meaning
expressing sadness or sorrow
Example
He raised a plaintive cry for help.
C1 noun /ˈɒptɪks/

optics

Meaning
The branch of physics dealing with light and vision.
Example
She studied optics to understand how lenses work.
C1 noun /ˈkɒnfɪdænt/

confidant

Meaning
A person with whom one shares a secret or private matter, trusting them not to repeat it.
Example
She found a true confidant in her childhood friend.
C1 adjective /ˈfɔːrmətɪv/

formative

Meaning
Having a lasting influence on a person's development or character.
Example
Childhood is often described as a formative stage in life.
C1 verb /bɪˈsɛt/

beset

Meaning
to trouble, harass, or attack on all sides
Example
The village was beset by constant floods.
C1 noun /ˈoʊ.mən/

Omen

Meaning
an event regarded as a sign of future good or bad luck
Example
Many people consider a black cat crossing your path a bad omen.
C1 noun /ʃruː/

shrew

Meaning
a small mouse-like animal; also a woman with a bad temper
Example
The play describes a strong-willed woman as a shrew.
C1 adjective /ˈfrɪvələs/

frivolous

Meaning
Not having any serious purpose or value; silly or unimportant.
Example
She dismissed the frivolous complaint quickly.
C1 adjective /ɪnˈɡroʊst/

engrossed

Meaning
completely absorbed or deeply involved in something
Example
She was so engrossed in the book that she forgot the time.
C1 verb /ˈpætər/

patter

Meaning
to make a repeated light tapping sound; to talk quickly in a rehearsed or mechanical way
Example
Rain pattered softly on the window.
C1 noun, adjective /ˈlæksətɪv/

laxative

Meaning
A medicine or substance that stimulates bowel movements; tending to loosen or relieve constipation.
Example
The doctor prescribed a mild laxative for her condition.
C1 adjective /ˈsʌmp.tʃu.əs/

sumptuous

Meaning
Splendid and expensive-looking; luxurious.
Example
The guests were treated to a sumptuous banquet.
C1 verb /rɪˈtælieɪt/

retaliate

Meaning
to make an attack in return for a similar attack
Example
The army retaliated after the enemy attack.
C1 adjective /ˌeɪ.bəlˈbɒd.id/

able-bodied

Meaning
physically strong and healthy, not disabled
Example
The company is looking for able-bodied workers for the construction site.
C1 noun /ˈælɪbaɪ/

alibi

Meaning
A claim or piece of evidence that one was elsewhere when an act, typically a crime, was committed.
Example
She had a strong alibi that proved she was at the cinema during the theft.
C1 noun /ˈmɑːrtər/

Martyr

Meaning
A person who is killed because of their religious or political beliefs
Example
He became a martyr for the cause of freedom and democracy.
C1 noun /wɪsp/

wisp

Meaning
A small thin or twisted bunch, piece, or amount of something.
Example
A wisp of smoke rose from the chimney.
C1 noun /kæʃ/

cache

Meaning
A hidden storage of items or a high-speed memory in computing.
Example
The hikers found a cache of supplies hidden under the rocks.
C1 noun /fɪˈlæn.θrə.pɪst/

philanthropist

Meaning
a person who seeks to promote the welfare of others, especially by donating money to good causes
Example
The philanthropist donated millions to build schools in rural areas.
C1 noun /ˈdaɪəˌlɛkt/

dialect

Meaning
A particular form of a language spoken in a specific region or by a specific group.
Example
He speaks a dialect of Bengali that is common in rural areas.
C1 verb /ˈlɪtɪˌɡeɪt/

litigate

Meaning
to engage in legal proceedings or take a dispute to court
Example
The company decided to litigate the contract dispute.
C1 noun /jɛn/

yen

Meaning
A deep, strong desire or craving.
Example
She felt a strong yen to travel the world.
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 /trænsˈfɜːrər/

transferrer

Meaning
A person who transfers something, such as property, rights, or responsibilities, to another.
Example
The transferrer is responsible for ensuring the property is legally passed on.
C1 verb /dɪˈteɪn/

detain

Meaning
to keep someone from proceeding; to hold back, especially by official authority
Example
The police detained the suspect for questioning.
C1 noun /aɪˈtɪnərɛri/

itinerary

Meaning
A planned route or schedule of a journey or trip.
Example
The travel agent gave us a detailed itinerary for our vacation.
C1 adjective /ˈmɔːrn.fəl/

mournful

Meaning
feeling, expressing, or causing sadness or grief
Example
The mournful song reminded her of lost loved ones.
C1 verb /kwɑːʃ/

quash

Meaning
To reject or void something legally or to put an end to something forcefully.
Example
The court quashed the decision due to lack of evidence.
C1 preposition/adverb/conjunction /ˌnɒtwɪθˈstændɪŋ/

notwithstanding

Meaning
In spite of; despite
Example
Notwithstanding the challenges, the team completed the project.
C1 noun /kənˈtɪn.dʒən.si/

contingency

Meaning
A provision for an unforeseen event or circumstance, especially in financial planning.
Example
The company has a contingency plan for economic downturns.
C1 verb /ˈwɪð.ər/

wither

Meaning
to dry up and die, typically used for plants
Example
The flowers will wither without enough water.
C1 adjective vəˈreɪ.ʃəs

voracious

Meaning
Having a very eager approach to an activity; wanting or devouring great quantities of food or having an insatiable appetite.
Example
He has a voracious appetite for knowledge.
C1 adjective /məˈlɪʃəs/

Malicious

Meaning
having or showing a desire to cause harm to someone; spiteful
Example
The malicious software damaged many computers.
C1 adjective /ɪˈfɛm.ər.əl/

ephemeral

Meaning
Lasting for a very short time; temporary or transitory.
Example
The beauty of cherry blossoms is ephemeral.
C1 adverb /ˈfɜː.vənt.li/

Fervently

Meaning
with passionate intensity; ardently; with great emotion or enthusiasm
Example
She fervently hoped that her dreams would come true.
C1 noun /ˈæŋɡwɪʃ/

anguish

Meaning
Severe mental or physical pain or suffering.
Example
She was in deep anguish after hearing the tragic news.
C1 noun

Longitude

C1 adjective rɪˈlɛntləs

relentless

Meaning
Oppressively constant; incessant; showing no abatement of severity, intensity, strength, or pace.
Example
The freedom fighters' relentless struggle led to victory.
C1 adjective /ˈrek.wɪ.zɪt/

Requisite

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

induct

Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
C1 noun /bəˈrɑːʒ/

barrage

Meaning
a concentrated outpouring of questions, criticisms, or blows; a rapid, continuous attack
Example
The politician faced a barrage of tough questions from reporters.
C1 adjective ˈsɪŋ.krə.nəs

synchronous

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

unbecoming

Meaning
Not proper or appropriate for a person; unsuitable.
Example
His rude behavior was unbecoming of a leader.
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 noun /ˌsɛlf ɪnˈdʌldʒəns/

self-indulgence

Meaning
The act of allowing oneself to enjoy pleasures or desires excessively.
Example
His weekend of self-indulgence included eating sweets and watching movies nonstop.
C1 noun /pərˈkʌʃən/

percussion

Meaning
Musical instruments that are played by striking, shaking, or scraping, such as drums or cymbals.
Example
The percussion section added rhythm and energy to the orchestra.
C1 noun /ˈblʌd.ʃed/

Bloodshed

Meaning
the killing or wounding of people, typically in large numbers during a conflict
Example
The peace treaty was signed to prevent further bloodshed.
C1 noun /ˌfəʊtəʊˈsɪnθɛtɪk ɪˈfɪʃənsi/

photosynthetic efficiency

Meaning
The measure of how effectively plants convert light energy into chemical energy through the process of photosynthesis, directly affecting plant growth and crop yield.
Example
Improving photosynthetic efficiency can increase crop yields.
C1 noun /ɡeɪl/

Gale

Meaning
a very strong wind; a wind of force 7 to 10 on the Beaufort scale
Example
The fishing boats returned to harbor early due to the approaching gale.
C1 noun /kəˈmændər ɪn tʃiːf/

Commander-in-chief

Meaning
the supreme leader of a nation's armed forces
Example
The president serves as the commander-in-chief of the military.
C1 adjective /ˌhæpi ɡoʊ ˈlʌki/

happy-go-lucky

Meaning
cheerfully unconcerned about the future; carefree
Example
She has a happy-go-lucky attitude and never worries about tomorrow.
C1 adjective /ˈnɪp.i/

Nippy

Meaning
cold; chilly; quick and agile in movement
Example
It's quite nippy outside today, you should wear a jacket.
C1 verb /ˈbæbəl/

babble

Meaning
to talk rapidly and continuously in a foolish way
Example
The baby babbles all day long.
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 adjective /ˈpɑːr.dən.ə.bəl/

Pardonable

Meaning
able to be forgiven; excusable
Example
His mistake was pardonable given the difficult circumstances.
C1 noun /ˈfiː.nɪks/

phoenix

Meaning
a mythical bird that is reborn from its ashes; symbol of immortality or renewal
Example
The legend says the phoenix rises from its ashes every 500 years.
C1 noun /ˈʌndərˌstʌdi/

understudy

Meaning
An actor who learns another's role to act as a replacement if needed.
Example
The understudy performed when the lead actor fell ill.
C1 verb /rɪˈbʌt/

rebut

Meaning
to argue against or prove wrong; to refute
Example
The lawyer rebutted the false accusations with strong evidence.
C1 noun/verb ˈpɪv.ət

pivot

Meaning
A significant change in business strategy or direction.
Example
The company decided to pivot its business strategy.
C1 adjective /mɪˈrækjələs/

Miraculous

Meaning
supernatural; amazing; extraordinary
Example
Her miraculous recovery amazed all the doctors.
C1 verb /lʊər/

lure

Meaning
to attract or tempt someone, often by offering something appealing
Example
The advertisement lured customers with promises of discounts.
C1 noun /ˈpreɪsiː/

precis

Meaning
A concise summary of a text or speech.
Example
The student submitted a précis of the long article.
C1 noun ˈmɪl.ɪ.tər.i ɪnˈkɜː.ʃən

military incursion

Meaning
A sudden armed attack or invasion by military forces into a territory.
Example
The military incursion caused widespread devastation.
C1 verb /kəˈpɪtjʊˌleɪt/

capitulate

Meaning
to surrender or give in after resisting
Example
The army had no choice but to capitulate to the enemy.
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 /smʌɡ/

smug

Meaning
having or showing an excessive pride in oneself or one's achievements
Example
He wore a smug smile after winning the debate.
C1 noun /ɪnˌkɑːsəˈreɪʃən/

incarceration

Meaning
the state of being imprisoned or confined
Example
The criminal faced years of incarceration for his crimes.
C1 noun /ˈvaɪəˌleɪtər/

violator

Meaning
A person who breaks or disregards a law, rule, or agreement.
Example
The police caught the traffic violator at the intersection.
C1 noun ˌʌndərˈprɪvəlɪdʒd ɡruːps

underprivileged groups

Meaning
Groups of people who lack basic necessities or advantages that are available to other members of society.
Example
Underprivileged groups benefit from social initiatives.
C1 noun /fɪˈdɛl.ɪ.ti/

fidelity

Meaning
Faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support.
Example
A dog's fidelity to its owner is unmatched.
C1 adjective /ˌtɒpsi ˈtɜːvi/

topsy-turvy

Meaning
in a state of confusion, disorder, or upside down
Example
The sudden announcement left the office in a topsy-turvy state.
C1 noun /deɪˈbɑː.kəl/

debacle

Meaning
A sudden and ignominious failure; a fiasco.
Example
The company's poor management led to a financial debacle.
C1 noun /ˈwed.lɒk/

Wed lock

Meaning
the state of being married; matrimony
Example
They have been happily united in wedlock for twenty years.
C1 verb /ˌriː.ɪˈstæblɪʃ/

reestablish

Meaning
to set up or restore something again after it has been disrupted
Example
The government worked hard to reestablish peace in the region.
C1 noun /rɪˈmɛmbrəns/

remembrance

Meaning
the act of remembering or honoring someone or something
Example
A service was held in remembrance of the fallen soldiers.
C1 adjective /ˌkætəˈɡɒrɪkəl/

categorical

Meaning
Absolute and without exception; expressed clearly and directly.
Example
She gave a categorical denial of the allegations.
C1 verb /ˌoʊvərˈrʌn/

overrun

Meaning
to spread over or occupy completely; to exceed a limit or time
Example
The garden was overrun with weeds.
C1 noun /fruˈɪʃən/

fruition

Meaning
The realization or fulfillment of a plan, project, or desire.
Example
Her dream of becoming a doctor finally came to fruition.
C1 noun /suˈpriː.mə.si/

Supremacy

Meaning
the state of being supreme; highest authority or power
Example
The country established naval supremacy in the region.
C1 noun ˌiː.kəʊˈfrend.li ˌɜː.bən.aɪˈzeɪ.ʃən

eco-friendly urbanization

Meaning
The development of cities in a way that is not harmful to the environment.
Example
Eco-friendly urbanization reduces environmental degradation.
C1 adjective /ˈtɔːrtʃuəs/

tortuous

Meaning
Full of twists and turns; excessively complex or complicated.
Example
The tortuous mountain road made driving very difficult.
C1 adverb /ˈɪnwərdli/

inwardly

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

inadequacy

Meaning
lack of sufficient ability, quality, or strength; a feeling of not being good enough
Example
She struggled with feelings of inadequacy at work despite her strong qualifications.
C1 adjective /præɡˈmæt.ɪk/

pragmatic

Meaning
Dealing with things sensibly and realistically in a way that is based on practical rather than idealistic considerations.
Example
He took a pragmatic approach to solving the financial crisis.
C1 verb /kənˈtraɪv/

contrive

Meaning
to plan or devise cleverly or skillfully
Example
She contrived a clever plan to surprise her friends.
C1 adjective /ˈtɛmpərəl/

temporal

Meaning
Relating to worldly affairs or to time rather than spiritual matters.
Example
The monk gave up his temporal possessions to live a simple life.
C1 noun ˈsʌb.tɛkst

subtext

Meaning
Hidden meaning or message behind spoken or written words
Example
The subtext of his speech suggested disagreement.
C1 verb /ˈsʌkɪŋ/

sucking

Meaning
Drawing in a liquid, air, or other substance through the mouth or a tube by creating a vacuum; also used figuratively for something unpleasant or ineffective
Example
The baby is sucking on a pacifier.
C1 adverb /ˈæmpli/

amply

Meaning
more than sufficiently; generously
Example
She was amply rewarded for her hard work.
C1 noun/verb /pɔːr/

pore

Meaning
As a noun: a tiny opening in the skin or surface. As a verb: to study something carefully.
Example
She pored over the documents for hours before making a decision.
C1 noun /oʊˈmɪʃ.ən/

Omission

Meaning
the action of excluding or leaving out someone or something; a failure to include
Example
The omission of his name from the list was intentional.
C1 noun /ˈtrɪnɪti/

trinity

Meaning
a group of three closely related things; in Christianity, the Father, the Son, and the Holy Spirit
Example
The museum’s exhibit focused on a trinity of themes: memory, identity, and power.
C1 noun /krʌks/

crux

Meaning
the most important or decisive point of an issue
Example
The crux of the problem lies in poor communication.
C1 adjective /rɪˈkʌr.ənt/

Recurrent

Meaning
happening repeatedly; occurring again and again; periodic;
Example
She has been suffering from recurrent headaches for months.
C1 adjective ʌnˈpær.ə.leld

Unparalleled

Meaning
Having no equal; unmatched, peerless, and supreme in quality or achievement.
Example
The unparalleled beauty of the Taj Mahal amazes visitors.
C1 noun /njʊəˈrəʊ.sɪs/

neurosis

Meaning
A relatively mild mental illness that is not caused by organic disease, involving symptoms of stress.
Example
His neurosis made social interactions difficult.
C1 verb /pɜːrdʒ/

purge

Meaning
To remove unwanted feelings, people, or things; to cleanse or purify.
Example
The new leader promised to purge corruption from the government.
C1 adjective /ˌsɛm.iˈæn.ju.əl/

semiannual

Meaning
Occurring twice a year; every six months.
Example
The company holds a semiannual meeting with all employees.
C1 noun ˌtrɪbjʊˈleɪʃən

tribulation

Meaning
A difficult time or suffering experience
Example
He endured many tribulations in his early years.