efficacious
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C2 adjective /ˌɛf.ɪˈkeɪ.ʃəs/

efficacious

Meaning
Successful in producing a desired or intended result; effective.
Example
The vaccine proved highly efficacious in preventing infections.
C2 verb /ɪkˈskruːʃieɪt/

excruciate

Meaning
to cause intense pain or suffering
Example
The injury excruciated him with unbearable pain.
C2 verb /ɪnˈθrɔːl/

enthral

Meaning
To captivate or hold someone’s full attention.
Example
The magician’s performance enthralled the audience.
C2 adjective /ˌɛkspəˈdɪʃəs/

expeditious

Meaning
Done with speed and efficiency.
Example
The expeditious delivery of the package was appreciated.
C2 adjective /ɛmˈpaɪriəl/

empyreal

Meaning
Heavenly, divine, or relating to the highest heavens.
Example
The poet described the empyreal beauty of the stars.
C2 noun /ˈiːɡlət/

eaglet

Meaning
A young eagle.
Example
The eaglet waited in the nest for its mother to return.
C2 noun /ˈɛlɪdʒi/

elegy

Meaning
A poem or song expressing sorrow, especially for someone who has died.
Example
The poet wrote an elegy for his late friend.
C2 verb /ɛkˈskɔːrieɪt/

excoriate

Meaning
To strongly criticize someone; to denounce severely.
Example
The critic excoriated the film for its poor script.
C2 verb /ɪnˈskɒns/

ensconce

Meaning
to settle comfortably or securely in a place; to hide or shelter firmly
Example
She ensconced herself in a cozy armchair by the fireplace.
C2 adjective /ɪˈkwɪvəkəl/

equivocal

Meaning
Open to more than one interpretation; ambiguous.
Example
His equivocal answer confused everyone.
C2 noun /ɪˈfluːviəm/

effluvium

Meaning
an unpleasant or harmful odor, secretion, or discharge
Example
The effluvium from the factory spread across the neighborhood.
C2 verb /ɪˈfeɪsɪŋ/

effacing

Meaning
erasing or making oneself inconspicuous; to remove or diminish in significance
Example
She kept effacing herself during the meeting so that others could shine.
C2 noun /ɪkˈspiːdiənsi/

expediency

Meaning
the quality of being convenient and practical despite possibly being improper or immoral
Example
He acted out of political expediency rather than principle.
C2 noun /ɪˈfɛmɪnəsi/

effeminacy

Meaning
The quality of showing traits traditionally associated with women, such as delicacy or softness.
Example
In ancient times, effeminacy was often criticized as a sign of weakness.
C2 adjective /ˌɛl.ɪˈdʒaɪ.ək/

elegiac

Meaning
Expressing sorrow, often for something past; resembling an elegy.
Example
The novel ends on an elegiac note, mourning the lost era.
C2 noun ˈɛn.ɡræm

Engram

Meaning
Physical signs or patterns in the brain for memory storage and retrieval
Example
Scientists study engrams to understand how memories are stored.
C2 noun /ˈɛnsaɪn/

ensign

Meaning
A flag or standard, especially a military or naval one indicating nationality; also a junior officer in the navy or coast guard.
Example
The ship raised its national ensign before leaving the harbor.
C2 verb /ɪˈnəʊbəl/

ennoble

Meaning
to give someone a noble rank or to elevate in dignity or honor
Example
His selfless actions ennobled his character in the eyes of others.
C2 adjective /ˈɛstɪməbl/

estimable

Meaning
Worthy of great respect.
Example
Her estimable achievements inspired the whole community.
C2 verb /ˌɛfəˈvɛs/

effervesce

Meaning
To give off bubbles of gas; to show excitement, liveliness, or enthusiasm.
Example
The soda began to effervesce as soon as it was opened.
C2 noun ˌiːkwəˈnɪməti

equanimity

Meaning
Mental calmness, composure, and evenness of temper, especially in a difficult situation.
Example
She handled the news with remarkable equanimity.
C2 adjective /juːˈdʒɛnɪk/

eugenic

Meaning
Relating to or aiming at improving the genetic quality of a population.
Example
In the early 20th century, some scientists supported eugenic policies.
C2 noun /ˈɛpɪˌsaɪkl/

epicycle

Meaning
a small circle whose center moves around the circumference of a larger one, used in ancient astronomy
Example
The concept of the epicycle was used to explain planetary motion.
C2 noun /ˈɛksplətɪv/

expletive

Meaning
a word or phrase used as an exclamation, often offensive or profane
Example
He shouted an expletive when he dropped the hammer on his foot.
C2 noun /ɪɡˈzɛmplɑːr/

exemplar

Meaning
A model or pattern to be copied or imitated.
Example
She is an exemplar of kindness and generosity.
C2 verb /ɪˈvɪsəˌreɪt/

eviscerate

Meaning
to remove the internal organs of; to deprive of essential content
Example
The critics eviscerated the movie for its weak storyline.
C2 adjective /juːˈfoʊniəs/

euphonious

Meaning
Pleasing to the ear; having a sweet sound.
Example
The poet's euphonious language made the verse a delight to read.
C2 verb /ɛnˈfrænˌtʃaɪz/

enfranchise

Meaning
To grant the right to vote or other rights of citizenship.
Example
The new law enfranchised thousands of people.
C2 adverb /ɪkˈstem.pɔːr/

Extempore

Meaning
without preparation; spontaneously; improvised
Example
The speaker delivered an impressive extempore speech at the conference.
C2 adjective ˈen.də.krɪn

endocrine

Meaning
Relating to or denoting glands that secrete hormones directly into the blood.
Example
The endocrine system regulates metabolism and growth.
C2 adjective /ˌen.zɪˈmæt.ɪk/

enzymatic

Meaning
Relating to or involving enzymes, which are proteins that catalyze biochemical reactions in living organisms.
Example
Enzymatic reactions regulate metabolism in the human body.
C2 noun /ˌiː.kəʊ.tɒkˈsɪ.kə.lə.dʒi/

ecotoxicology

Meaning
The study of the effects of chemical pollution on the environment.
Example
Ecotoxicology studies the effects of pesticides on wildlife.
C2 noun /ɪˈluːʒən/

elusion

Meaning
The act of escaping or avoiding something, especially by cleverness or trickery.
Example
His constant elusion of responsibility frustrated his colleagues.
C2 noun /ˈɛpɪkjʊr/

epicure

Meaning
A person who enjoys fine food and drink, often with refined taste.
Example
As an epicure, she always sought out the finest restaurants in the city.
C2 noun /ˈɛmɪsɛri/

emissary

Meaning
A person sent on a special mission, usually as a diplomatic representative.
Example
The king sent an emissary to negotiate peace.
C2 verb /ɛmˈbleɪzən/

emblazon

Meaning
To decorate or display something in a noticeable or impressive way.
Example
The team's logo was emblazoned on their uniforms.
C2 adjective /ɪkˈsɛpʃənəbl/

exceptionable

Meaning
Open to objection; causing disapproval.
Example
His rude remarks were considered exceptionable by everyone present.
C2 noun /ɪkˌspɒstjʊˈleɪʃən/

expostulation

Meaning
the act of expressing protest or disagreement
Example
His expostulation against the unfair rules was ignored.
C2 adjective /ˈek.wə.bəl/

Equable

Meaning
calm and even-tempered; not easily disturbed
Example
He maintained an equable temperament throughout the crisis.
C2 verb /ɛnˈfiːbəl/

enfeeble

Meaning
To make weak or feeble; to deprive of strength.
Example
The long illness enfeebled the old man.
C2 verb /ɪˈmɛnd/

emend

Meaning
to correct or revise a text, especially for errors
Example
The editor emended the manuscript before publication.
C2 noun /ɪˌlɛkˈtrɑː.lə.sɪs/

electrolysis

Meaning
A chemical decomposition produced by passing an electric current through a liquid or solution.
Example
Electrolysis is used to separate hydrogen from water.
C2 noun /ɛnˈsɪklɪkəl/

encyclical

Meaning
a formal letter sent by the Pope to Catholic churches, usually addressing important issues
Example
The Pope issued an encyclical on climate change and moral responsibility.
C2 verb /ˈɛkskʌlpeɪt/

exculpate

Meaning
to show or declare that someone is not guilty of wrongdoing
Example
The lawyer worked hard to exculpate his client.
C2 noun /ɪˌdʒækjʊˈleɪʃən/

ejaculation

Meaning
The action of suddenly saying something or the release of semen during sexual climax.
Example
His sudden ejaculation of joy surprised everyone in the room.
C2 verb /ɪkˈstruːd/

extrude

Meaning
to force something out through a small opening; to shape by pushing material through a mold
Example
The factory extrudes plastic pipes using modern machines.
C2 noun /ɛmˈpɔːriəm/

emporium

Meaning
A large retail store selling a wide variety of goods.
Example
They visited the new emporium to buy furniture and home decor.
C2 verb /ˈjuːləˌdʒaɪz/

eulogize

Meaning
To praise highly in speech or writing, especially in honor of someone who has died.
Example
They gathered to eulogize their beloved teacher.
C2 adjective /ɪˈfʌldʒənt/

effulgent

Meaning
Shining brilliantly; radiant.
Example
Her effulgent smile brightened everyone's mood.
C2 noun /eɪˈklɑː/

eclat

Meaning
Brilliant success, acclaim, or great public approval.
Example
The artist's debut performance was met with great éclat.
C2 noun /ˌiː.tiˈɒ.lə.dʒi/

etiology

Meaning
the cause or origin of a disease or condition
Example
Doctors are studying the etiology of the new virus.
C2 adjective /ˌeθ.noʊˈsen.trɪk/

ethnocentric

Meaning
evaluating other cultures according to the standards of one's own culture
Example
His ethnocentric attitude made it hard for him to appreciate foreign traditions.
C2 adjective /ˌɛkjʊˈmɛnɪkəl/

ecumenical

Meaning
Promoting unity among different Christian churches or religions.
Example
The leaders gathered for an ecumenical conference to encourage dialogue.
C2 verb /ɪˈfɛktʃueɪt/

effectuate

Meaning
to put into force or cause to happen; to bring about
Example
The manager effectuated the changes to improve efficiency.
C2 adjective /ˈɛnərˌveɪtɪd/

enervated

Meaning
Lacking energy, vitality, or strength; weakened or exhausted.
Example
After the long meeting, she felt completely enervated.
C2 noun /ˈaɪ.sɔːr/

Eyesore

Meaning
something that is very ugly and unpleasant to look at
Example
The abandoned building has become an eyesore in the neighborhood.
C2 noun /ˈiːən/

eon

Meaning
an indefinitely long period of time; an age
Example
Dinosaurs lived millions of years ago, in a different eon.
C2 noun /ɪˌkliːziˈæstɪk/

ecclesiastic

Meaning
A member of the clergy or church official.
Example
The council was attended by several high-ranking ecclesiastics.
C2 adjective /ɪˈfjuːsɪv/

effusive

Meaning
Expressing feelings of gratitude, pleasure, or approval in an unrestrained or heartfelt manner.
Example
She gave him an effusive welcome after his long journey.
C2 noun /juː/

Ewe

Meaning
a female sheep
Example
The ewe gave birth to twin lambs.
C2 verb /ɪkˈstɛmpəraɪz/

extemporize

Meaning
To speak or perform without preparation; improvise.
Example
The actor had to extemporize when he forgot his lines.
C2 noun /ˌɛfləˈrɛsəns/

efflorescence

Meaning
the process of flowering or reaching an optimal stage of development
Example
The garden was at the peak of its efflorescence in spring.
C2 verb /ɪnˈsnɛər/

ensnare

Meaning
to catch or trap, often by trickery or deceit
Example
The hunter ensnared the rabbit with a net.
C2 noun /ɪˈlɛk.trə.taɪp/

electrotype

Meaning
A duplicate printing plate made by electroplating a mold of the original.
Example
The printer used an electrotype to produce multiple copies of the page.
C2 verb /ˈekspərˌɡeɪt/

expurgate

Meaning
To remove offensive or objectionable parts from a text or speech.
Example
The publisher decided to expurgate the novel before reprinting it.
C2 noun /ɪˈklɛktɪˌsɪzəm/

eclecticism

Meaning
A method or practice of deriving ideas, style, or taste from a broad and diverse range of sources.
Example
The architect’s work shows eclecticism by blending modern and traditional elements.
C2 noun /ˈeb.taɪd/

Ebb-tide

Meaning
the movement of the tide out to sea; a time when the sea level is falling
Example
During ebb-tide, we could walk further out on the beach.
C2 noun /ˈɛmbəˌlɪzəm/

embolism

Meaning
the sudden blockage of a blood vessel by a clot or other foreign matter
Example
The patient suffered a fatal pulmonary embolism.
C2 adjective /ˌɛnkəˈmiːæstɪk/

encomiastic

Meaning
Expressing praise; laudatory.
Example
The book was filled with encomiastic remarks about the author.
C2 noun /ˈɛpəlɛt/

epaulette

Meaning
A variant spelling of epaulet, also meaning a shoulder ornament, especially on military uniforms.
Example
The officer’s epaulette shone brightly under the sunlight.
C2 noun /ɪˈfrʌntəri/

effrontery

Meaning
shameless or rude boldness
Example
He had the effrontery to lie even when caught red-handed.
C2 verb /ɪnˈθroʊn/

enthrone

Meaning
to install someone on a throne or to give someone high status
Example
The king was enthroned in a grand ceremony.
C2 noun /ɪˈskʌtʃən/

escutcheon

Meaning
a shield or emblem bearing a coat of arms
Example
The family crest was displayed on the escutcheon above the fireplace.
C2 noun /ˈɛksɪdʒənsi/

exigency

Meaning
an urgent need or demand requiring immediate attention
Example
In times of war, the exigency of the situation requires quick decisions.
C2 verb /ɪnˈsaɪfər/

encipher

Meaning
to convert a message into code or cipher
Example
The agent enciphered the secret message before sending it.
C2 verb /ˈek.stər.peɪt/

extirpate

Meaning
to completely remove or destroy something unwanted
Example
The government launched a program to extirpate corruption from public offices.
C2 verb /ˈɛkspieɪt/

expiate

Meaning
to make amends for guilt or wrongdoing
Example
He tried to expiate his crime by helping the poor.
C2 verb /ɪkˈspeɪʃiˌeɪt/

expatiate

Meaning
to speak or write at length or in detail
Example
The professor expatiated on the importance of critical thinking.
C2 verb /ˌɛvəˈnɛs/

evanesce

Meaning
To disappear gradually; to fade away.
Example
The mist began to evanesce as the sun rose higher.
C2 noun /ɪksˈtʃɛkər/

exchequer

Meaning
The treasury of a state or country.
Example
The government announced new measures to improve the exchequer.
C2 verb /ɪnˈræptʃər/

enrapture

Meaning
To fill someone with great delight or joy.
Example
The beautiful music enraptured the audience.
C2 noun /ˌɛpɪˈsaɪklɔɪd/

epicycloid

Meaning
a curve traced by a point on the circumference of a circle that rolls around the outside of another circle
Example
The mathematician demonstrated how to draw an epicycloid.
C2 noun /ɪkˈsɪʒən/

excision

Meaning
the act of cutting something out, especially by surgical removal
Example
The excision of the infected tissue prevented further complications.
C2 noun /ɪˌpɪstəˈmɒlədʒi/

epistemology

Meaning
The branch of philosophy that studies the nature, origin, and scope of knowledge.
Example
Epistemology explores the difference between justified belief and opinion.
C2 adjective /ˌɛvəˈnɛsənt/

evanescent

Meaning
Quickly fading or disappearing; lasting for only a very short time.
Example
The beauty of the sunset was evanescent, fading within minutes.
C2 verb /ɪnˈtwaɪn/

entwine

Meaning
to twist or wind together; to become closely connected or involved
Example
The vines entwine around the old fence.
C2 adjective /ɪˈmɛrɪtəs/

emeritus

Meaning
having retired but allowed to retain their title as an honor
Example
He is a professor emeritus at the university.
C2 noun /ˈɛpɪtɑːf/

epitaph

Meaning
A short text written on a tombstone in memory of the deceased.
Example
The gravestone bore an epitaph honoring the soldier’s bravery.
C2 noun /ˈɛkwɪpɔɪz/

equipoise

Meaning
A state of balance or equilibrium.
Example
Her calmness created an equipoise in the heated debate.
C2 noun /ˈɛpəʊd/

epode

Meaning
A form of lyric poem written in couplets, often following a strophe and antistrophe in classical Greek poetry.
Example
The poet concluded his ode with a striking epode.
C2 adjective /ˈɛksplɪkəbəl/

explicable

Meaning
able to be explained or understood
Example
His sudden anger was explicable given the stressful situation.
C2 adjective /ɪˈfiːt/

effete

Meaning
Lacking vitality, strength, or effectiveness; weak and overrefined.
Example
The empire became effete after centuries of indulgence.
C2 verb /ɪkˈspɛktəreɪt/

expectorate

Meaning
to cough up and spit out mucus from the throat or lungs
Example
The patient began to expectorate thick mucus.
C2 noun /ɪˈfʌldʒəns/

effulgence

Meaning
Brilliant radiance or shining brightness.
Example
The effulgence of the sunrise lit up the entire valley.
C2 noun /ˈɪəri/

eyrie

Meaning
the nest of a bird of prey, such as an eagle, typically built high on a cliff or tree
Example
The eagle’s eyrie was perched high on the mountain cliff.
C2 verb /ɪnˈkæmp/

encamp

Meaning
to set up or establish a camp
Example
The soldiers encamped near the river for the night.
C2 verb /ˈeksɔːrsaɪz/

exorcise

Meaning
To drive out an evil spirit or bad influence through rituals or prayers.
Example
The priest was called to exorcise the spirit from the house.
C2 noun /ˌɛfəˈvɛsəns/

effervescence

Meaning
The release of gas bubbles; vivacity or high-spiritedness.
Example
Her effervescence made her the life of the party.
C2 adjective /ɪˈpɪstələri/

epistolary

Meaning
Related to the writing of letters; expressed in or through letters.
Example
The novel is written in an epistolary style, consisting of letters between characters.
C2 noun /juːˌtrɑː.fɪˈkeɪ.ʃən/

eutrophication

Meaning
Excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.
Example
Excess fertilizers lead to eutrophication in lakes.
C2 noun /ɛˌspriː də ˈkɔːr/

esprit de corps

Meaning
A feeling of pride, fellowship, and loyalty shared by members of a group.
Example
The team's esprit de corps was evident in their cooperative effort.
C2 adjective /ɪkˈspɒzɪtəri/

expository

Meaning
intended to explain or describe something
Example
The teacher gave an expository lecture on the topic.
C2 adjective /ɛkˈstrɪnzɪk/

extrinsic

Meaning
Not part of the essential nature of someone or something; coming from outside.
Example
His motivation was largely extrinsic, driven by rewards and recognition.
C2 verb /ɪmˈbɪtər/

embitter

Meaning
To make someone resentful or angry; to cause bitterness.
Example
The unfair treatment embittered the employees.
C2 noun /ˈɪəri/

eyry

Meaning
an alternative spelling of eyrie; a nest of a bird of prey
Example
The falcon guarded its eyry fiercely.
C2 noun /ɪˌkwɪvəˈkeɪʃən/

equivocation

Meaning
The use of ambiguous language to conceal the truth or to avoid committing oneself.
Example
The politician’s equivocation frustrated voters who wanted a clear answer.
C2 verb /ɪˈdjuːs/

educe

Meaning
To draw out or bring forth something latent or hidden.
Example
The teacher tried to educe a response from the shy student.
C2 verb /ɪˈfeɪs/

efface

Meaning
To erase or wipe out something; to make oneself inconspicuous.
Example
Time had effaced the letters on the old gravestone.
C2 noun /ˌɛntəˈmɒlədʒi/

entomology

Meaning
The scientific study of insects.
Example
She studied entomology to understand the behavior of bees.
C2 noun /ˈɛndaɪv/ or /ˈɑːndɪv/

endive

Meaning
A leafy vegetable belonging to the chicory family, often used in salads.
Example
She added fresh endive to the salad for a slightly bitter flavor.
C2 verb /ɪnˈtriːt/

entreat

Meaning
To ask earnestly or beg someone to do something.
Example
She entreated him to stay a little longer.
C2 noun /ˌɛmjʊˈleɪ.ʃən/

emulation

Meaning
Reproducing something or following someone to achieve success.
Example
The software allows the emulation of old video games on modern devices.
C2 adjective /ˌɛlɪˈfæntaɪn/

elephantine

Meaning
Huge, clumsy, or resembling an elephant in size or movement.
Example
The man moved with an elephantine grace.
C2 verb /ɪˈvɜːrt/

evert

Meaning
To turn inside out or outward.
Example
The surgeon had to evert the eyelid during the procedure.
C2 noun /ɪkˌsprəʊ.priˈeɪ.ʃən/

expropriation

Meaning
The act of government taking private property, also known as confiscation, nationalization, or seizure.
Example
The land expropriation led to disputes among landowners.
C2 noun /ˌɛpɪˈdɜːrmɪs/

epidermis

Meaning
the outer layer of cells covering the body of an organism, especially the skin
Example
The epidermis protects the body from harmful bacteria.
C2 adjective ˈɛr.jʊ.daɪt

erudite

Meaning
Having or showing great knowledge or learning; scholarly and intellectual.
Example
The professor's erudite lecture fascinated the students.
C2 verb /ɪɡˈzʌlt/

exult

Meaning
to show or feel great joy, often as a result of success
Example
The fans exulted after their team won the championship.
C2 noun /ɛnˈkoʊmiəm/

encomium

Meaning
A speech or piece of writing that praises someone or something highly.
Example
He delivered an encomium to his retiring teacher.
C2 noun /ˈɛskwaɪər/

esquire

Meaning
A title of respect often used after a man's name, especially for lawyers in the United States.
Example
John Smith, Esquire, will be representing the client in court.
C2 noun /ɪˈbʊliəns/

ebullience

Meaning
the quality of being cheerful, enthusiastic, and full of energy
Example
The teacher's ebullience inspired her students.