willful
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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 /ˈlæt.ɪ.tuːd/

Latitude

Meaning
the angular distance of a place north or south of the earth's equator; freedom to act or think
Example
The GPS device showed our exact latitude and longitude coordinates on the map.
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 /ˈhaɪ.drəʊˌpaʊər ˌdʒen.əˈreɪ.ʃən/

hydropower generation

Meaning
The production of electrical power through the use of the gravitational force of falling or flowing water.
Example
Hydropower generation promotes green energy.
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 adjective /ˈrʌɡ.ɪd/

Rugged

Meaning
rough and uneven; having a rough irregular surface; tough and strong
Example
The hikers crossed the rugged mountain terrain.
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 verb /rɪˈdrɛs/

redress

Meaning
to set right, remedy, or compensate for a wrong or grievance
Example
The company promised to redress the complaints of its customers.
C1 adjective /ˌkætəˈklɪzmɪk/

cataclysmic

Meaning
Relating to or denoting a violent natural event or upheaval.
Example
The war had cataclysmic effects on the nation's economy.
C1 adjective dɪsˈfʌŋkʃənl

dysfunctional

Meaning
Not operating normally or properly.
Example
The dysfunctional system led to numerous delays and errors.
C1 noun /əˌfɪl.iˈeɪ.ʃən/

affiliation

Meaning
The state or process of affiliating or being affiliated; a connection or association.
Example
His affiliation with the company lasted for a decade.
C1 noun /ˈɛspiənɑːʒ/

espionage

Meaning
The practice of spying or using spies to gather secret information, usually for political or military purposes.
Example
The agent was arrested on charges of espionage against the state.
C1 noun ˈpɑː.sɪŋ

parsing

Meaning
The process of analyzing sentence structure to understand grammatical relationships.
Example
The AI model performs parsing to understand syntax.
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 verb /ˈskʌt.əl/

scuttle

Meaning
To run hurriedly with short, quick steps; or to deliberately sink a ship.
Example
The children scuttled back to their seats when the teacher entered.
C1 noun /ˈsæf.aɪər/

Saphire

Meaning
a precious stone that is typically blue in color
Example
The royal crown was adorned with a large sapphire.
C1 noun /ˈdrɪz.əl/

Drizzle

Meaning
light rain falling in very fine drops; a very light rainfall
Example
The gentle drizzle continued throughout the morning, making everything misty.
C1 adjective /ˌhaɪdroʊɪˈlɛktrɪk/

hydroelectric

Meaning
Relating to or denoting the generation of electricity using flowing water.
Example
The country invested heavily in hydroelectric power plants.
C1 exclamation /juˈriːkə/

eureka

Meaning
An exclamation used to express a sudden discovery or realization.
Example
When the solution finally came to him, he shouted, 'Eureka!'
C1 adverb, adjective /ˌɪnkɑːɡˈniːtoʊ/

incognito

Meaning
In disguise or with one's identity concealed.
Example
The celebrity traveled incognito to avoid the paparazzi.
C1 noun /ˈpriːsɪŋkt/

precinct

Meaning
A district or area within the boundaries of a city, often for police or electoral purposes.
Example
She went to vote at her local precinct.
C1 noun /iːl/

Eel

Meaning
a long, snake-like fish that lives in both fresh and salt water
Example
The electric eel can generate powerful electric shocks.
C1 noun /ˈsækrɪlɪdʒ/

sacrilege

Meaning
Violation or misuse of what is regarded as sacred.
Example
Stealing from the temple was considered an act of sacrilege.
C1 noun /kæsˈkeɪd/

Cascade

Meaning
a waterfall; a succession of stages or operations
Example
The mountain cascade created a beautiful natural swimming pool below.
C1 noun /ˈmɑː.kɪt ˌpen.ɪˈtreɪ.ʃən/

Market Penetration

Meaning
A measure of the amount of sales or adoption of a product or service compared to the total theoretical market for that product or service.
Example
High market penetration ensures competitive dominance.
C1 verb /præns/

prance

Meaning
To move with high, springy steps, often to show off or attract attention.
Example
The horse pranced around the field gracefully.
C1 adjective /ɡlʌm/

Glum

Meaning
sad; dejected; downcast; gloomy
Example
He looked glum after hearing the bad news.
C1 adjective /ˌɪnkənˈsiːvəbl̩/

inconceivable

Meaning
Impossible to imagine or believe; beyond comprehension.
Example
It seemed inconceivable that she could finish the marathon after such little training.
C1 noun /ˈdɛməɡɒɡ/

demagogue

Meaning
A political leader who seeks support by appealing to popular desires and prejudices rather than by using rational argument.
Example
The crowd was swayed by the fiery speeches of the demagogue.
C1 noun /ˈreɪdiəns/

radiance

Meaning
the quality of shining with bright light; a glowing or beaming quality
Example
Her face was filled with radiance after hearing the good news.
C1 verb /ˌriːəˈfɜːrm/

reaffirm

Meaning
To state again strongly; to confirm or strengthen a statement or belief.
Example
The president reaffirmed his commitment to education reform.
C1 noun /ˈbærɪˌtoʊn/

baritone

Meaning
a male singing voice between tenor and bass
Example
The singer’s baritone voice impressed the audience.
C1 noun /ˈdaɪnəˌmoʊ/

dynamo

Meaning
A machine that generates electricity; a person with great energy and enthusiasm.
Example
She is the real dynamo behind the success of the company.
C1 noun kənˈvɜː.dʒəns

convergence

Meaning
The process of coming together from different directions to meet at a common point; unification or integration.
Example
The convergence of technologies is revolutionizing industries.
C1 noun /saɪˈteɪʃən/

citation

Meaning
a quotation from or reference to a book, paper, or author
Example
The research paper included a citation from Shakespeare.
C1 adjective /ˈnæk.ərd/

Knackered

Meaning
extremely tired; exhausted
Example
I'm absolutely knackered after working all day.
C1 adjective /ɪˈstreɪndʒd/

estranged

Meaning
no longer close or affectionate with someone; alienated
Example
She felt estranged from her family after the long dispute.
C1 adjective /ˈperɪʃəbəl/

Perishable

Meaning
liable to decay quickly; short-lived
Example
Store perishable foods in the refrigerator.
C1 adjective + noun ʌnˈpresɪdentɪd ˈnɒlɪdʒ

unprecedented knowledge

Meaning
Information or understanding that has never been obtained or achieved before.
Example
Artemis will provide unprecedented knowledge about the solar system.
C1 verb /ˈkɒr.ə.leɪt/

correlate

Meaning
To have a mutual relationship or connection; to establish a relationship between two or more things.
Example
Researchers found that diet and mental health correlate strongly.
C1 adjective /ˈædʒɪteɪtɪd/

Agitated

Meaning
disturbed; anxious; restless; excited in a negative way
Example
He became agitated when he heard the bad news.
C1 verb /ˈlɪbəreɪt/

liberate

Meaning
to set free from imprisonment, oppression, or restraint
Example
The army liberated the city from enemy control.
C1 noun /ˈkæzəm/

chasm

Meaning
a deep fissure in the earth's surface or a wide difference between people or ideas
Example
There was a great chasm between the two political parties.
C1 noun /dʒɪst/

Gist

Meaning
the substance or essence of a speech or text; the main point
Example
I missed the beginning of the lecture, but I caught the gist of the professor's argument.
C1 noun /moʊˈzeɪɪk/

mosaic

Meaning
A picture or pattern produced by arranging together small pieces of stone, tile, or glass.
Example
The church ceiling was decorated with a beautiful mosaic.
C1 noun /ʃəˈmiːz/

Chemise

Meaning
a woman's loose-fitting undergarment or dress hanging straight from the shoulders
Example
The vintage chemise was made of delicate lace and silk.
C1 noun /əˈliː.dʒəns/

allegiance

Meaning
Loyalty or commitment of a subordinate to a superior or of an individual to a group or cause.
Example
Soldiers take an oath of allegiance to their country.
C1 noun ɪnˈflɛk.ʃən

inflection

Meaning
The change in pitch or tone of voice when speaking for emphasis.
Example
His inflection kept the audience engaged.
C1 verb dɪˈsaɪ.fɚ

decipher

Meaning
To convert something written in code into normal language; to succeed in understanding the meaning of something.
Example
It took hours to decipher the ancient script.
C1 adjective /oʊˈvɜːrt/

overt

Meaning
Done or shown openly; not hidden or secret.
Example
There was an overt display of hostility between the rivals.
C1 verb /kənˈviːn/

convene

Meaning
to come together or assemble, especially for a meeting or formal gathering
Example
The board will convene tomorrow to discuss the new policy.
C1 noun ɪɡˌzæs.pəˈreɪ.ʃən

exasperation

Meaning
Extreme irritation or frustration.
Example
He sighed in exasperation after hearing the same excuse again.
C1 adverb /ˌɪnsɪˈdɛntəli/

incidentally

Meaning
by the way; used to introduce a remark not directly related to the main subject
Example
Incidentally, did you know that she studied in Paris?
C1 adjective /pərˈveɪsɪv/

pervasive

Meaning
Existing in or spreading through every part of something
Example
Pervasive technology has become a fundamental part of daily life.
C1 noun səˈfɪʃənsi

sufficiency

Meaning
The condition of being adequate or enough; adequacy.
Example
The sufficiency of food supply is critical for survival.
C1 noun /ˈskɛptɪk/

skeptic

Meaning
A person who doubts or questions accepted beliefs or claims.
Example
The scientist was a skeptic of theories without solid evidence.
C1 adjective /ˈkɒnvɛks/

convex

Meaning
curved or rounded outward
Example
The lens has a convex shape to focus light.
C1 adverb /əˈnjuː/

anew

Meaning
In a new or different way; once more.
Example
After the failure, she decided to start her life anew.
C1 verb, noun /kweɪl/

quail

Meaning
verb: to feel or show fear; noun: a small, short-tailed bird
Example
She quailed at the sight of the approaching storm.
C1 noun /ˈɒfʃuːt/

offshoot

Meaning
A branch or result that develops from something larger or more important.
Example
The startup was an offshoot of a major tech company.
C1 noun /ˈklæmər/

clamor

Meaning
a loud and confused noise, especially of people shouting insistently
Example
The clamor of the protesting crowd filled the square.
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 /ˌvɜːbəlɪˈzeɪʃən/

verbalization

Meaning
The action of expressing something in words.
Example
The verbalization of his thoughts was clear and direct.
C1 verb /əˈnʌl/

annul

Meaning
to declare something legally invalid or cancel it
Example
The court decided to annul the marriage due to fraud.
C1 adjective /ɪmˈbrɔɪld/

embroiled

Meaning
being deeply involved in a difficult situation, conflict, or scandal
Example
She found herself embroiled in a heated family dispute.
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 verb /pɑːrs/

parse

Meaning
to analyze a sentence or text grammatically or logically
Example
The software can parse large amounts of text data efficiently.
C1 adjective /ɪnˈdɪɡnənt/

indignant

Meaning
Feeling or showing anger at something considered unfair or unjust.
Example
She was indignant when accused of cheating.
C1 adjective /ʌnˈtoʊld/

Untold

Meaning
very great in amount or degree; countless; immeasurable
Example
The earthquake caused untold damage to the city.
C1 noun /ɪmˈpɒs.tər/

Impostor

Meaning
a person who pretends to be someone else in order to deceive others; a fraud
Example
The impostor convinced everyone he was a doctor until his fake credentials were discovered.
C1 verb /rɪˈlɛnt/

relent

Meaning
to become less severe, harsh, or strict
Example
After hours of begging, she finally relented.
C1 noun /ˈθɪk.ɪt/

Thicket

Meaning
a dense group of bushes or trees; a thick growth of shrubs
Example
The rabbit disappeared into the thicket.
C1 adjective /ɪnˈflæməbəl/

Inflammable

Meaning
easily set on fire; flammable; combustible
Example
The inflammable material caught fire quickly.
C1 noun /dɪsˈsɜːrvɪs/

disservice

Meaning
A harmful action; something that does damage rather than help.
Example
Spreading false information is a disservice to the community.
C1 noun /ˈpɛdɪɡriː/

pedigree

Meaning
the recorded ancestry or lineage of a person, family, or animal; the history or origin of something
Example
The dog has a pedigree that traces back several generations.
C1 verb /bɪˈhoʊld/

behold

Meaning
to see or observe something, especially something remarkable or impressive
Example
She stood quietly to behold the sunrise over the hills.
C1 adjective ɪˈveɪ.sɪv

evasive

Meaning
Tending to avoid commitment or self-revelation, especially by responding only indirectly.
Example
He gave an evasive answer to avoid trouble.
C1 verb /fɔːrˈɡoʊ/

forego

Meaning
to decide not to do or have something pleasant or valuable
Example
She decided to forego dessert to maintain her diet.
C1 adjective /dɪsˈpæʃənət/

dispassionate

Meaning
not influenced by strong emotion; impartial
Example
The judge remained dispassionate throughout the trial.
C1 noun ˈsɒv.rɪn.ti

sovereignty

Meaning
The authority of a state to govern itself or another state; supreme power or authority.
Example
Sovereignty is essential for a nation's identity.
C1 noun /ˌiː.kwɪˈlɪb.ri.əm/

equilibrium

Meaning
A state of physical balance or stability in physical, mental, or economic conditions.
Example
The market reached an equilibrium between supply and demand.
C1 noun /ˌsʌb.stɪˈtjuː.ʃən/

substitution

Meaning
the action of replacing someone or something with another
Example
The substitution of the old system with the new one was difficult.
C1 noun /ˈhɑː.stɪdʒ/

Hostage

Meaning
a person seized or held as security for the fulfillment of a condition; captive
Example
The police negotiated carefully to secure the release of all hostages unharmed.
C1 noun ɪˌməʊ.ʃəˈnæl.ɪ.ti

emotionality

Meaning
The quality of being driven by emotions rather than reason; emotional responsiveness.
Example
His emotionality often influenced his decisions.
C1 noun /təˈræntjʊlə/

tarantula

Meaning
A large hairy spider found in warm regions.
Example
The tarantula crawled across the desert floor.
C1 noun /rɪˈnaʊn/

Renown

Meaning
the condition of being known or talked about by many people; fame
Example
The scientist achieved international renown for her discoveries.
C1 noun/verb /ˈkætəpʌlt/

catapult

Meaning
A device for launching objects at high speed; to hurl or launch something suddenly.
Example
The invention catapulted him to international fame.
C1 noun /ɡrəˈtjuːɪti/

gratuity

Meaning
A sum of money given as a tip or a retirement benefit.
Example
The waiter received a generous gratuity for his excellent service.
C1 adjective /ˈvɛnərəbəl/

Venerable

Meaning
deserving respect due to age, wisdom, or character; revered
Example
The venerable professor has taught at the university for fifty years.
C1 noun /woʊ/

woe

Meaning
great sorrow, distress, or trouble
Example
Her heart was filled with woe after hearing the sad news.
C1 verb /ɔːɡˈmɛnt/

augment

Meaning
To increase or strengthen something.
Example
The company plans to augment its workforce.
C1 noun /ˈtriːkəl/

treacle

Meaning
A thick, sweet syrup; excessively sentimental speech or writing.
Example
She poured treacle over the pancakes.
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, verb /tɪndʒ/

tinge

Meaning
a slight added color, flavor, or feeling; to add a slight amount of color or quality
Example
Her voice was tinged with sadness.
C1 noun ˌmɪsˈmænɪdʒmənt

mismanagement

Meaning
Bad or careless management of something.
Example
Mismanagement of plastic waste worsens pollution.
C1 noun ˌlaɪ.əˈbɪl.ə.ti

liability

Meaning
The state of being responsible for something, especially by law; a debt or financial obligation.
Example
The company's liabilities exceeded its assets.
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 verb /ˈeɪ.li.ə.neɪt/

alienate

Meaning
To make someone feel isolated or estranged; to cause someone to become unfriendly.
Example
His rude behavior alienated many of his friends.
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 /djuːn/

dune

Meaning
A hill or ridge of sand formed by the wind, usually found in deserts or near beaches.
Example
The children played on the sand dune by the beach.
C1 noun, adverb /ˈeɪliəs/

alias

Meaning
A false or assumed identity; also used to mean 'otherwise called'.
Example
The criminal was known by the alias 'Shadow'.
C1 noun /sɪlk klɔːθ/

Silk cloth

Meaning
fabric made from natural fibers produced by silkworms
Example
The bride wore a beautiful dress made of silk cloth.
C1 adjective /ˈsiː.naɪl/

senile

Meaning
Showing the weaknesses of old age, especially mental decline.
Example
The old man became senile and forgot familiar faces.
C1 noun /ˈsɪtəˌdɛl/

citadel

Meaning
A fortress protecting or dominating a city.
Example
The ancient citadel stood guard over the town for centuries.
C1 noun /ˈɡlɒs.ər.i/

Glossary

Meaning
an alphabetical list of terms in a particular domain of knowledge with explanations; a brief dictionary
Example
The textbook includes a helpful glossary at the end to define technical terms.
C1 noun /ˈmæɡnɪtuːd/

Magnitude

Meaning
The great size or extent of something; importance
Example
The magnitude of the earthquake was measured at 7.5 on the Richter scale.
C1 adjective /hɜːrˈbɪv.ər.əs/

Herbivorous

Meaning
feeding on plants; plant-eating
Example
Cows are herbivorous animals that graze on grass.
C1 noun /ˈpɑːrtʃmənt/

parchment

Meaning
a thin material made from animal skin, used in the past for writing
Example
The ancient manuscript was written on parchment.
C1 noun dɪˈdʒɛnəˌreɪtɪv dɪˈzizɪz

degenerative diseases

Meaning
Medical conditions that involve the deterioration or progressive decline of tissues, organs, or functions
Example
Degenerative diseases are common in an aging population.
C1 noun /ˈblɪs.tər/

Blister

Meaning
a small bubble on the skin filled with serum and caused by friction, burning, or other damage
Example
The new shoes gave her a painful blister on her heel.
C1 adjective, verb /ˈeɪlɪŋ/

ailing

Meaning
suffering from illness or poor health; experiencing problems or decline
Example
The ailing patient slowly began to recover after treatment.
C1 noun /ˈfreɪlti/

frailty

Meaning
The condition of being weak, delicate, or easily broken.
Example
Old age often comes with physical frailty.
C1 /splɪnt/

splint

Meaning
A rigid device used to support and immobilize a broken or injured body part.
Example
The doctor applied a splint to stabilize the patient's broken arm.
C1 noun /ˈded.lɑk/

Dead-lock

Meaning
a situation in which no progress is possible; complete standstill
Example
The negotiations reached a deadlock when neither side would compromise.
C1 noun /ˈrɛɡjəleɪtər/

regulator

Meaning
a person or device that controls or maintains the operation of a system
Example
The government appointed a new regulator for the financial sector.
C1 verb /ˈʃɪmər/

shimmer

Meaning
To shine with a soft, wavering light.
Example
The lake shimmered under the moonlight.
C1 adjective /ˈræmpənt/

rampant

Meaning
existing or spreading unchecked, often in an undesirable way
Example
Corruption was rampant in the city administration.
C1 noun /ˈfɔːrˌfɑːðər/

forefather

Meaning
an ancestor, especially one who was part of an earlier generation of a family or nation
Example
Our forefathers fought for independence.
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 verb /ˈrɛzəneɪt/

resonate

Meaning
To produce or be filled with a deep, full, and reverberating sound; to evoke a feeling or memory.
Example
Her words resonated with the audience.
C1 verb /kəˈmɛmɔˌreɪt/

commemorate

Meaning
To honor and remember someone or something through a ceremony or action.
Example
The statue was built to commemorate the fallen heroes.