perimeter
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C1 noun /pəˈrɪm.ɪ.tər/

perimeter

Meaning
the continuous line forming the boundary of a closed geometric figure or area
Example
The soldiers guarded the perimeter of the camp.
C1 adjective /rɪˈpjuː.t̬ɪd/

Reputed

Meaning
generally said or believed to be; having a particular reputation
Example
He is reputed to be one of the best doctors in the country.
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/adjective /ˈbaɪ.ɡɒn/

bygone

Meaning
Something belonging to an earlier time; past and no longer existing.
Example
He often talks about the traditions of bygone days.
A1 adjective/adverb /ɪˈnʌf/

enough

Meaning
as much or as many as required
Example
We have enough food for everyone.
C1 noun, verb /bʌldʒ/

bulge

Meaning
A swelling or protruding part; to swell outward or protrude.
Example
The bag began to bulge with too many books inside.
B1 noun flæɡz

flags

Meaning
A piece of cloth or similar material, typically oblong or square, attachable by one edge to a pole or rope.
Example
The streets were decorated with national flags.
C2 noun /əbˈsɪdiən/

obsidian

Meaning
A hard, dark, glasslike volcanic rock formed by rapid solidification of lava.
Example
The knife was made from sharp obsidian.
C1 adjective /ˈtɛlˌteɪl/

telltale

Meaning
Revealing something that is usually hidden; giving away a secret or clue.
Example
The telltale signs of fatigue were visible on his face.
C1 noun, verb /ˈmæn.deɪt/

mandate

Meaning
an official order or command; to give someone authority to act in a certain way
Example
The government issued a mandate to reduce carbon emissions.
C2 noun /ˈsɛrəf/

seraph

Meaning
An angelic being associated with light and purity, often depicted as a high-ranking angel in Christian theology.
Example
The stained-glass window depicted a seraph with outstretched wings.
B1 noun /ˈkæmpəs/

campus

Meaning
The grounds and buildings of a university, college, or school.
Example
The university campus is filled with students during the fall semester.
A2 noun /drʌɡ/

drug

Meaning
a substance used as a medicine or an illegal addictive substance
Example
The doctor prescribed a new drug for the illness.
B2 noun/verb /dɪˈspjuːt/

dispute

Meaning
a disagreement or argument about something important
Example
The two countries are in dispute over the border issue.
C2 noun /ˈplɛnɪtjuːd/

plenitude

Meaning
the condition of being full or abundant; a great quantity
Example
The garden was a plenitude of flowers in spring.
C1 adjective /ɪˈmuː.və.bəl/

immovable

Meaning
Not able to be moved; fixed in position.
Example
Immovable barriers prevent change.
C1 noun /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

Meaning
The unsustainable use of natural resources at a rate that exceeds their ability to regenerate, leading to depletion and environmental degradation.
Example
Overexploitation of natural resources leads to environmental degradation.
C1 adjective /ˌsuː.pəˈsɒn.ɪk/

Supersonic

Meaning
faster than the speed of sound; relating to speeds greater than the speed of sound
Example
The supersonic jet broke the sound barrier.
B2 noun /kʌlt/

cult

Meaning
a system of religious veneration and devotion directed toward a particular figure or object
Example
The cult followed their leader with great devotion.
A2 verb /hiːt/

heat

Meaning
to make or become hot or warm
Example
Please heat the soup before serving.
C2 verb /ˈrævɪʃ/

ravish

Meaning
To fill with intense delight; to captivate or enchant.
Example
The beauty of the sunset ravished the travelers.
A1 pronoun /ˈʌðərz/

others

Meaning
people or things distinct from the ones already mentioned or known
Example
I like to spend time with others.
C1 noun /ˌɪn.trəˈvɜːr.ʒən/

introversion

Meaning
The tendency to be inward-looking and shy, preferring solitary activities.
Example
Her introversion made it difficult for her to enjoy large parties.
B1 noun /ˈlɛktʃərər/

lecturer

Meaning
a person who gives lectures, especially at a college or university
Example
The lecturer explained the theory with clear examples.
C2 adjective /ˈpæsɪbəl/

passible

Meaning
capable of feeling or suffering; susceptible to sensation or emotion (often theological)
Example
In some traditions, deities are described as passible, sharing human emotions.
C1 noun ˌɪn.fɪlˈtreɪ.ʃən

infiltration

Meaning
The process of entering or gaining access to an organization or place surreptitiously.
Example
Cybersecurity prevents infiltration into sensitive data.
C1 noun /juːˈfɔː.ri.ə/

euphoria

Meaning
A feeling or state of intense excitement and happiness; elation.
Example
Winning the championship brought a sense of euphoria.
C1 noun /djʊˈrɛs/

duress

Meaning
threats, violence, or pressure used to force someone to do something
Example
She signed the contract under duress.
A2 verb /kaʊnt/

count

Meaning
to determine the total number of something
Example
She carefully counted the money on the table.
C1 noun /ˌdɪsəˈluːʃən/

dissolution

Meaning
the act of formally ending or breaking apart something, such as an organization or marriage
Example
The dissolution of the company was announced yesterday.
C2 verb /ɪnˈdɒktrɪˌneɪt/

indoctrinate

Meaning
To teach someone to fully accept a set of beliefs or ideas without question.
Example
The regime tried to indoctrinate the youth with propaganda.
C2 noun /ˈæntɪk/

antic

Meaning
a playful, funny, or silly act or gesture
Example
The children laughed at the clown’s antics.
B2 verb /dɪsˈtʃɑːrdʒ/

discharge

Meaning
to release or dismiss from duty; to emit or give off
Example
The hospital will discharge the patient tomorrow.
B1 noun /ˈsoʊ.lər ˌsɪs.təm/

Solar system

Meaning
the sun and all the planets, moons, asteroids and other objects that orbit around it
Example
Our solar system has eight planets orbiting the sun.
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 noun /ˈswiːt.miːt/

Sweetmeat

Meaning
a small piece of confectionery or candy; a sweet delicacy
Example
The children enjoyed the traditional sweetmeats during the festival.
C1 noun /ɪˈnɪɡ.mə/

enigma

Meaning
A person or thing that is mysterious, puzzling, or difficult to understand.
Example
Life remains an enigma to many.
C1 noun /ˈvɪstə/

vista

Meaning
A pleasing view, especially one seen through a long, narrow opening.
Example
From the mountain top, we admired the breathtaking vista of the valley below.
C2 adjective /ˈɛksɪdʒənt/

exigent

Meaning
demanding immediate action or attention; urgent
Example
The patient’s exigent condition required immediate surgery.
B2 adjective /fɔːrˈsiːəbl/

foreseeable

Meaning
Able to be predicted or expected in advance
Example
The company is unlikely to make changes in the foreseeable future.
C1 noun /treɪd fəˌsɪl.ɪˈteɪ.ʃən/

trade facilitation

Meaning
The simplification, modernization and harmonization of export and import processes.
Example
Trade facilitation boosts economic growth.
C2 noun /dɪˈprævɪti/

depravity

Meaning
moral corruption; wickedness
Example
The film portrays the moral depravity of a corrupt society.
C2 adjective /ˈɔːrnəri/

ornery

Meaning
bad-tempered and combative; stubborn
Example
The ornery old man refused to leave his chair.
B1 noun /ˈkær.ə.væn/

Caravan

Meaning
a group of people traveling together, especially through desert areas
Example
The merchant caravan crossed the desert with camels carrying precious goods.
B1 adjective /əˈmjuː.zɪŋ/

Amusing

Meaning
causing laughter or providing entertainment; funny; enjoyable
Example
The children found the clown's performance very amusing.
C1 verb /ˈstriːm.laɪn/

streamline

Meaning
To make a process simpler and more efficient.
Example
The company aims to streamline production to reduce costs.
C2 adjective /ˌdaɪəˈtɒmɪk/

diatomic

Meaning
Consisting of two atoms.
Example
Oxygen is a diatomic molecule.
C1 noun /naɪˈiːvteɪ/

naivete

Meaning
The quality of being naive; lack of experience, wisdom, or judgment.
Example
His naivete made him an easy target for manipulation.
C1 verb /əˈseɪl/

assail

Meaning
to attack violently, either physically or with words
Example
The politician was assailed with difficult questions.
C1 adjective ɪˈroʊ.ni.əs

erroneous

Meaning
Wrong; incorrect.
Example
His assumptions were completely erroneous.
C1 noun /ˈmelənkəli/

Melancholy

Meaning
A feeling of pensive sadness; thoughtful or gentle sadness
Example
A deep melancholy settled over him after reading the old letters.
B2 noun /ˈpɒp.i/

Poppy

Meaning
a bright red flower with black seeds, often used as a symbol of remembrance
Example
The red poppy bloomed beautifully in the garden.
B2 noun ˌdiː.fɒr.ɪˈsteɪ.ʃən

deforestation

Meaning
The action of clearing a wide area of trees; the permanent destruction of forests in order to make the land available for other uses.
Example
Deforestation accelerates the loss of biodiversity.
C2 noun /juːˌtɪlɪˈtɛəriənɪzəm/

utilitarianism

Meaning
The ethical theory that actions are right if they are useful or for the benefit of the majority.
Example
Utilitarianism suggests that we should act to maximize overall happiness.
A2 noun /ˈsɒftweə/

software

Meaning
the programs and other operating information used by a computer
Example
He installed the software to enhance the performance of his computer.
C1 noun /ˌtæm.bəˈriːn/

Tambourine

Meaning
a small drum with metal discs around the edge that jingle when shaken or hit
Example
She shook the tambourine to the rhythm of the music.
B2 noun /ˈdoʊnər/

donor

Meaning
A person who gives something, especially to a charity or cause.
Example
The donor contributed generously to the hospital’s new wing.
B1 adjective /ˌlɛftˈhændɪd/

left-handed

Meaning
Using or done with the left hand; also can mean clumsy or awkward.
Example
She is left-handed and writes beautifully with her left hand.
C2 adjective /ˈvɪsɪd/

viscid

Meaning
Having a thick, sticky consistency.
Example
The sap had a viscid texture that stuck to his hands.
A2 adjective /ˈwɛstərn/

western

Meaning
relating to or characteristic of the West, especially Europe and the Americas
Example
She loves western music and culture.
C1 verb, noun /mɛʃ/

mesh

Meaning
To fit or work together properly; or a material made of interlaced threads.
Example
The two gears mesh perfectly to keep the machine running smoothly.
C2 noun /ˌluː.mɪˈnɛs.əns/

luminescence

Meaning
The emission of light by a substance not resulting from heat; a type of cold light.
Example
The luminescence of the fireflies lit up the forest.
A1 noun /ˈɡrændˌmʌðər/

grandmother

Meaning
the mother of one's father or mother
Example
My grandmother makes delicious cakes.
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.
A2 adjective kɑːm

calm

Meaning
Not showing or feeling nervousness, anger, or other strong emotions; peaceful.
Example
The calm environment supports healing.
C2 verb (archaic/rare) /rɛk/

reck

Meaning
To care about or be concerned with (something); to have regard for.
Example
He does not reck the dangers of his actions.
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.
C2 noun /ˌkæl.sɪ.fɪˈkeɪ.ʃən/

calcification

Meaning
The process of calcium accumulation in soil, making it hard.
Example
Calcification reduces soil permeability and affects crop growth.
A1 verb, adjective /oʊn/

own

Meaning
to possess something; belonging to oneself
Example
She owns a beautiful house in the city.
B1 noun /ˈsʌn.flaʊər/

Sun flower

Meaning
a large yellow flower that turns to face the sun
Example
The sunflower field looked amazing in the bright sunlight.
C2 adjective /ʌnˈælɔɪd/

unalloyed

Meaning
Pure, complete, and not mixed with anything else.
Example
She felt unalloyed joy at the news of her success.
B2 noun /ˈɜː.dʒən.si/

Urgency

Meaning
the quality of requiring immediate action or attention; pressing importance
Example
The urgency of the situation required immediate medical attention.
C1 noun prɪˌsɪp.ɪˈteɪ.ʃən

precipitation

Meaning
Rain, snow, sleet, or hail that falls to or condenses on the ground.
Example
Annual precipitation levels are decreasing.
A2 adjective /ˈwɜːrid/

worried

Meaning
feeling anxious or concerned about something
Example
She was worried about the upcoming exam.
A2 noun /ˈsɛlˌfoʊn/

cellphone

Meaning
a portable telephone that uses a cellular network for wireless communication
Example
She forgot her cellphone at home and couldn’t call anyone.
C1 noun /prɪˈzʌmp.ʃən/

Presumption

Meaning
an idea that is taken to be true without proof
Example
There is a presumption of innocence in the legal system.
C2 noun ˈɒpjʊləns

opulence

Meaning
Great wealth or luxuriousness.
Example
The opulence of the mansion was evident in its ornate furnishings.
B2 adverb /ʌnˈkaɪndli/

unkindly

Meaning
in a cruel, harsh, or unsympathetic manner
Example
She spoke unkindly about her colleague during the meeting.
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 /ˈmɪl.ɪ.tənt/

Militant

Meaning
A person who uses aggressive or violent methods to promote a political or social cause
Example
The militant group demanded immediate political reforms.
C2 noun kəmˈpʌŋk.ʃən

compunction

Meaning
A feeling of guilt or moral scruple that prevents or follows the doing of something bad.
Example
He felt compunction after lying to his friend.
B2 noun /diːp siː/

deep sea

Meaning
The deep parts of the sea or ocean, typically beyond the continental shelf.
Example
Many deep-sea creatures produce bioluminescence for survival.
A2 noun /teɪl/

Tail

Meaning
the rear part of an animal that extends from the back or bottom
Example
The dog wagged its tail happily when it saw its owner.
C1 verb /bɪˈsɛt/

beset

Meaning
to trouble, harass, or attack on all sides
Example
The village was beset by constant floods.
C2 noun /ˈpɒliˌɑːrki/

polyarchy

Meaning
government by many people
Example
Polyarchy allows multiple parties to share power.
C1 verb /ˈlɔːndər/

launder

Meaning
to wash clothes, linens, etc.; or to conceal the origins of money obtained illegally
Example
She laundered all the dirty clothes on Sunday.
B2 verb /əˈbɒlɪʃ/

abolish

Meaning
to formally end or stop something; to cancel or eliminate completely
Example
The government decided to abolish the old tax system.
B2 verb /dʌmp/

dump

Meaning
to drop or dispose of something carelessly; to end a relationship suddenly
Example
He dumped all the trash into the bin.
B2 noun /ˈhæb.ɪ.tæt/

habitat

Meaning
The natural environment where an organism lives and meets its needs.
Example
The polar bear's natural habitat is the Arctic region.
C1 noun /ˈsɪndɪkət/

syndicate

Meaning
A group of individuals or organizations combined to promote a common interest or carry out a business venture.
Example
A syndicate of investors bought the struggling company.
C2 adjective /ˌmʌl.tɪˈfeə.ri.əs/

Multifarious

Meaning
having many different aspects or forms; diverse and varied
Example
The company has multifarious business interests including technology, finance, and healthcare.
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.
C2 noun /dɪˈdʒɛkʃən/

dejection

Meaning
a state of sadness, depression, or low spirits
Example
She sat in a state of dejection after hearing the bad news.
B2 noun /ˈpɑː.tɪ.klz/

particles

Meaning
Minute portions of matter.
Example
PM2.5 particles harm respiratory health.
C1 noun ˌæf.ɔːr.ɪˈsteɪ.ʃən

afforestation

Meaning
The action of planting trees on an area of land in order to form a forest.
Example
Afforestation helps restore biodiversity.
C2 adjective /ˈdɪfɪdənt/

diffident

Meaning
Shy or lacking confidence in one's own abilities.
Example
He was too diffident to ask a question in class.
C1 adjective /sɛkˈtɛəriən/

sectarian

Meaning
relating to or characterized by the differences between sects, often leading to conflict
Example
The region has been troubled by sectarian violence for decades.
C1 adjective /ɪmˈpɛtʃ.u.əs/

impetuous

Meaning
Acting or done quickly and without thought or care; impulsive.
Example
His impetuous decision led to unexpected consequences.
B2 noun ˈæk.tɪv rɪˈkɔːl

Active recall

Meaning
A learning technique that involves actively trying to retrieve information from memory rather than passively reviewing material.
Example
Active recall improves long-term memory and retention.
B2 noun ˌfʌŋk.ʃəˈnæl.ə.ti

functionality

Meaning
The quality of being functional; the ability to work or operate as intended.
Example
The new refrigerator has improved functionality.
C2 noun /ˌmɪnəˈrɛt/

minaret

Meaning
A tall, slender tower of a mosque, from which the call to prayer is announced.
Example
The minaret of the mosque could be seen from miles away.
A1 conjunction /ænd/

and

Meaning
Used to connect words or sentences that are to be taken jointly.
Example
She bought apples and oranges.
C2 adjective /ɪnhɑːrˈmoʊniəs/

Inharmonious

Meaning
lacking harmony; discordant in sound; not in tune
Example
The inharmonious sounds from the broken piano made everyone cover their ears.
C2 noun /ˈhɔːtɪnəs/

haughtiness

Meaning
The appearance or quality of being arrogantly superior and disdainful.
Example
His haughtiness made him unpopular among his peers.
C1 adjective /pəˈnʌltɪmət/

penultimate

Meaning
second to the last in a sequence or series
Example
She finished the penultimate chapter before going to sleep.
A1 noun neɪmz

Names

Meaning
A word or set of words by which a person or thing is known.
Example
Names of family members are written on the family tree.
C2 adjective əˈdrɔɪt

adroit

Meaning
clever or skillful in using the hands or mind.
Example
She is adroit at solving complex problems.
C1 adjective /səˈnɔːrəs/

sonorous

Meaning
Deep, full, and rich in sound.
Example
The actor's sonorous voice filled the entire theater.
B1 noun /ˈkemɪst/

chemist

Meaning
a scientist who studies chemistry; a person trained to prepare and dispense medicines
Example
The chemist analyzed the sample to determine its composition.
C2 noun /ˌɪmprəˈsɑːrioʊ/

impresario

Meaning
A person who organizes or finances concerts, plays, or operas.
Example
The impresario arranged a series of concerts for the rising star.
C1 adjective, noun /ɪnˈdɪkətɪv/

indicative

Meaning
Serving as a sign or expression of something; in grammar, a mood used to make factual statements.
Example
His tone was indicative of his frustration.
B2 adjective /ˈsoʊbər/

Sober

Meaning
not affected by alcohol; serious and thoughtful; moderate
Example
He remained sober throughout the celebration.
C1 noun /ɪmˈpɛdɪmənt/

impediments

Meaning
A hindrance or obstruction in doing something; things that prevent progress or achievement.
Example
Economic impediments often hinder social development.
B2 noun /ˌstɪm.jəˈleɪ.ʃən/

stimulation

Meaning
The action of arousing interest, enthusiasm, or excitement.
Example
Stimulation reduces stress and aids relaxation.
C2 verb /ˈhæroʊ/

harrow

Meaning
to cause distress or torment; also to break up and smooth soil with a farm tool
Example
The tragic news harrowed the entire family.
B2 noun /rɪˈzembləns/

Resemblance

Meaning
the state of being alike or similar; similarity in appearance or character
Example
There's a strong resemblance between the two sisters.
C2 noun /ˈtɜːrpɪtuːd/

turpitude

Meaning
depraved or wicked behavior or character
Example
The judge condemned the criminal’s act of moral turpitude.
C1 verb /rɪˈkuːpəreɪt/

recuperate

Meaning
to recover from illness or regain strength
Example
She went to the countryside to recuperate after surgery.
B2 adjective /slɪm/

slim

Meaning
thin in an attractive or healthy way; small in amount or chance
Example
She looked slim in her new dress.
C2 noun /ˈtjuːtɪlɪdʒ/

tutelage

Meaning
The act of guarding, protecting, or guiding; instruction or teaching.
Example
She studied painting under the tutelage of a famous artist.
A2 noun /mɛs/

mess

Meaning
A state of disorder or untidiness.
Example
The kids left the room in a complete mess.