radiation
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B2 noun ˌreɪdɪˈeɪʃən

radiation

Meaning
The emission of energy as electromagnetic waves or as moving subatomic particles.
Example
Radiation from the sun can be harmful without protection.
C1 verb /rɪˈkuːpəreɪt/

recuperate

Meaning
to recover from illness or regain strength
Example
She went to the countryside to recuperate after surgery.
C1 adjective /rɪˈmoʊtɪd/

remoted

Meaning
placed at a distance; made remote
Example
The system was remoted to a secure location.
B2 noun /ˈreɪ.zɪnz/

Raisins

Meaning
dried grapes, often used in cooking and baking
Example
She added raisins to the oatmeal cookies for extra sweetness.
C1 noun ˈrez.ɪ.djuː

residue

Meaning
A small amount of something that remains after the main part has gone or been removed.
Example
Soap residue affects appliance efficiency.
C1 adjective /rɪˈvenʒ.fəl/

Revengeful

Meaning
seeking or desiring revenge; vindictive
Example
He became revengeful after being betrayed by his friend.
A1 noun, adjective, adverb /raɪt/

right

Meaning
something that is morally good, fair, or just; or a legal/entitled claim
Example
Everyone has the right to free speech.
B1 noun rɪˈsɜː.tʃəz

researchers

Meaning
People who study and investigate to discover new information or facts.
Example
Researchers are working on innovative solutions.
B2 adjective /ˈrɪdən/

ridden

Meaning
Full of or dominated by something unpleasant.
Example
The country was ridden with corruption.
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 noun /rəˈpɪdəti/

rapidity

Meaning
The quality of moving or happening quickly; swiftness or speed.
Example
The rapidity of technological change is astonishing.
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.
C2 noun /ˈrʊkəri/

rookery

Meaning
a place where rooks or other birds breed and nest in colonies
Example
We saw a rookery full of noisy birds near the forest.
C1 verb /rɪˈfjuːt/

refute

Meaning
To prove a statement, argument, or theory to be false or invalid.
Example
The lawyer refuted the witness's testimony with solid evidence.
C2 noun /ˈrɛd.ə.ləns/

redolence

Meaning
a pleasant smell or the quality of suggesting something strongly
Example
The redolence of jasmine filled the evening air.
C1 adjective /rɪˈpen.tənt/

Repentant

Meaning
feeling or expressing sincere regret and remorse; sorry for one's actions
Example
The repentant thief returned the stolen money.
C1 adjective /ræpt/

Rapt

Meaning
completely fascinated or absorbed by what one is seeing or hearing
Example
The children listened with rapt attention to the storyteller.
A1 adjective /raʊnd/

round

Meaning
having a circular shape; shaped like a sphere or disk
Example
The table was round and had a smooth surface.
C2 noun /ˈreɪdɪks/

radix

Meaning
the base or root of something; the number on which a system of numeration is built
Example
In mathematics, the decimal system has a radix of ten.
B2 verb /rɪˈvoʊlt/

revolt

Meaning
to rebel against authority; to feel disgust
Example
The people revolted against the corrupt government.
B2 adjective /ræʃ/

rash

Meaning
Acting quickly without careful consideration; reckless.
Example
It was a rash decision to invest without research.
C1 noun /rɪˈfɜːrər/

referrer

Meaning
a person who directs someone to another person or service
Example
The referrer earned a bonus for recommending a new client.
C1 noun /rʌk/

Ruck

Meaning
a situation where a crowd of people are pushing against each other; a disorderly crowd
Example
There was a ruck at the football match.
C1 verb ˈrɛk.tɪ.faɪ

rectify

Meaning
To correct mistakes or make something right.
Example
The company took steps to rectify its financial mistakes.
B1 noun /roʊp/

rope

Meaning
a strong, thick cord made of twisted fibers or strands
Example
The climbers used a rope to scale the mountain.
C1 adjective /rɪˈsɜːrdʒənt/

resurgent

Meaning
Becoming strong, active, or popular again.
Example
The resurgent economy gave hope to many businesses.
B1 verb /rɑːb/

rob

Meaning
to steal money or property from a person or place; to commit robbery
Example
The thief tried to rob the bank last night.
B2 adjective /raɪp/

Ripe

Meaning
fully developed and ready to eat; mature; ready for action or use
Example
The bananas are ripe and ready to eat.
A2 verb /rɪˈtɜːrn/

return

Meaning
to come or go back to a place; to give back
Example
I will return home tomorrow.
B2 verb /riːp/

reap

Meaning
to cut or gather a crop; to receive as a consequence of actions
Example
Farmers reap wheat in the late summer.
C2 verb /ˈrʌstɪkeɪt/

rusticate

Meaning
To go to the countryside or to suspend someone from university.
Example
He decided to rusticate in the village to escape the busy city life.
A2 noun, verb /raʊ/ (argument), /roʊ/ (line of things)

row

Meaning
A line of things or people; also, a noisy quarrel; to propel a boat with oars.
Example
They had a loud row about money.
C1 noun ˈrəʊvə

rover

Meaning
A vehicle for driving over rough terrain, especially one driven by remote control over extraterrestrial terrain.
Example
The rover landed on Mars to begin its exploration.
B1 noun /rɪˈzɔː.sɪz/

resources

Meaning
A stock or supply of money, materials, staff, and other assets.
Example
The region was rich in herbal resources.
A1 adjective /ˈrɛd.i/

ready

Meaning
Prepared or available for use or action.
Example
She was ready to leave for the airport.
B2 noun, verb, adjective /ræŋk/

rank

Meaning
A position in a hierarchy; to place in order according to importance or quality.
Example
She quickly rose to a senior rank in the company.
C1 noun /rɪˌtæl.iˈeɪ.ʃən/

Retaliation

Meaning
the action of returning a military attack; counterattack; revenge for an injury or wrong
Example
The country threatened retaliation against any act of aggression.
C1 noun /ˈrɪpəl/

Ripple

Meaning
a small wave on the surface of water; a spreading effect or influence
Example
The stone created ripples across the calm pond.
C1 verb /ˌriːɪmˈbɜːrs/

reimburse

Meaning
to pay back money to someone who has spent it or lost it
Example
The company reimbursed him for travel expenses.
C1 verb /ˌriːɪnˈsteɪt/

reinstate

Meaning
To restore someone or something to their former position or condition.
Example
The company decided to reinstate the suspended employee.
C2 adjective /ˈreɪ.moʊs/

ramose

Meaning
having many branches.
Example
The ramose tree shaded the entire garden.
B2 verb /rɪˈkʌvərɪŋ/

recovering

Meaning
the process of getting better after illness, loss, or difficulty
Example
She is still recovering from the flu.
B2 adjective /rɪˈspek.tə.bəl/

Respectable

Meaning
worthy of respect; having good reputation; decent
Example
He comes from a respectable family in the community.
C1 verb /ˌriːˈkɒn.stɪ.tʃuːt/

reconstitute

Meaning
to restore something to its original form or state; to reassemble
Example
The group was reconstituted after the leader returned.
B1 noun riˈæləti

reality

Meaning
The world or the state of things as they actually exist, as opposed to an idealistic or notional idea.
Example
The reality of the situation was evident.
C1 noun /ˈrez.ɪ.dənt ˈkəʊ.ɔː.dɪ.neɪ.tər/

resident coordinator

Meaning
A local administrator or official who coordinates activities in a specific region.
Example
The resident coordinator welcomed all representatives.
B1 noun /ˈreɪn.dɪər/

Reindeer

Meaning
a large deer with branched horns that lives in cold northern areas
Example
Santa's reindeer pulled his sleigh across the sky.
C2 verb /rɪˈdaʊnd/

redound

Meaning
to contribute greatly to a result or consequence, usually beneficial
Example
His hard work will redound to the success of the company.
B2 noun /ˈrɪk.ʃɔː/

Rickshaw

Meaning
a light two-wheeled passenger vehicle drawn by one or more people
Example
We took a rickshaw to reach the busy marketplace.
B2 noun ˌrɛzɪɡˈneɪʃən

resignation

Meaning
The acceptance of something undesirable but inevitable; giving up.
Example
Her resignation from the position was unexpected.
A1 noun /roʊd/

road

Meaning
a wide way leading from one place to another
Example
We drove along the road to the village.
B1 verb /rɪˈleɪt/

relate

Meaning
to connect or show a link between; to tell a story
Example
She relates her experience to the audience.
C1 noun /ˈruːdɪmənt/

rudiment

Meaning
A basic principle, element, or fundamental part of something.
Example
He learned the rudiments of music before joining the band.
B2 noun /ˈraɪfəl/

Rifle

Meaning
a gun with a long barrel that is fired from the shoulder
Example
The soldier carried a rifle during the mission.
C1 noun /rɪˈkluːs/

recluse

Meaning
A person who lives alone and avoids other people; someone who lives a solitary life.
Example
The old man lived as a recluse in the mountains.
C2 verb /rɪˈspaɪər/

respire

Meaning
To breathe in and out; to inhale and exhale.
Example
Plants also respire to release energy.
C2 noun /raɪm/

rime

Meaning
frost formed on cold surfaces by freezing water vapor
Example
The trees were covered with a white rime after the cold night.
A2 adjective /ˈriː.sənt/

Recent

Meaning
happening not long ago; new; current;
Example
The recent changes in weather patterns concern scientists.
B2 verb /ˈroʊ.teɪt/

rotate

Meaning
to turn around a central point or axis
Example
The Earth rotates on its axis once every 24 hours.
C1 verb /ˈrevəl/

revel

Meaning
to enjoy oneself in a lively and noisy way; to take great pleasure in
Example
They revel in their success.
C1 verb /rɪˈklaɪn/

recline

Meaning
To lean or lie back in a relaxed position.
Example
She reclined on the sofa with a book.
C1 adjective /rɪˈstreɪnd/

restrained

Meaning
characterized by reserve or self-control; held back
Example
Her restrained reaction surprised everyone.
C1 phrase ˈriː.dʒən.əl ˈfɔː.rəm

regional forum

Meaning
A meeting or conference where representatives from countries or organizations in a specific geographical area discuss issues of common interest.
Example
The Regional Forum discussed deforestation impacts.
C1 noun /ˈrɛtrəsˌpɛkt/

retrospect

Meaning
the act of looking back on or reviewing past events
Example
In retrospect, the decision seemed unwise.
C1 verb /ˈræn.sæk/

ransack

Meaning
to search a place roughly and steal or damage things
Example
Burglars ransacked the house while the family was away.
B1 verb rɪˈdjuːst

reduced

Meaning
Make smaller or less in amount, degree, or size.
Example
Singapore has reduced plastic usage significantly.
C1 adjective /ˈrænsɪd/

rancid

Meaning
having a bad taste or smell due to being old or spoiled (especially fats or oils)
Example
The butter had gone rancid after being left out too long.
C2 noun /ˈriːdʒənt/

regent

Meaning
a person who rules in place of a monarch when the monarch is absent or too young
Example
The prince acted as regent until the king came of age.
B2 noun /ˌrɛprɪzɛnˈteɪʃən/

representation

Meaning
the action of speaking or acting on behalf of someone or something
Example
Her representation of the team was impeccable.
C2 verb /ˈrævɪʃ/

ravish

Meaning
To fill with intense delight; to captivate or enchant.
Example
The beauty of the sunset ravished the travelers.
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.
C2 verb /rɛnd/

rend

Meaning
to tear something apart violently or forcefully
Example
The explosion rent the air with a deafening noise.
B2 adjective ˌrev.əˈluː.ʃən.ər.i

revolutionary

Meaning
Involving or causing a complete or dramatic change.
Example
Revolutionary ideas are reshaping the industry.
C1 adjective /ˈreɪ.kɪʃ/

Rakish

Meaning
having a dashing, jaunty, or slightly disreputable quality or appearance
Example
He wore his hat at a rakish angle that gave him a charming appearance.
C1 adjective /rɪˈpʌl.sɪv/

Repulsive

Meaning
extremely unpleasant; causing strong dislike or disgust
Example
The smell of rotten eggs was absolutely repulsive.
B1 adjective /rɪˈmoʊt/

remote

Meaning
Situated far from the main centers of population; distant.
Example
They stayed in a remote village during their trip.
B2 adjective /ˈrɒt.ən/

Rotten

Meaning
decayed; spoiled; bad
Example
The apple is rotten and should be thrown away.
C1 verb /ˈrɛplɪkeɪt/

replicate

Meaning
to copy, reproduce, or duplicate something exactly
Example
The scientist tried to replicate the experiment for accuracy.
B2 verb /reɪl/

rail

Meaning
to complain or protest strongly about something
Example
He railed against the unfair decision.
C1 verb /rɪˈdiːm/

redeem

Meaning
to compensate for faults or mistakes; to exchange something for value
Example
He managed to redeem his reputation after the scandal.
B2 noun /ˈrest.ləs.nəs/

Restlessness

Meaning
the inability to rest or relax as a result of anxiety or boredom
Example
His restlessness during the long meeting was obvious to everyone.
C1 adjective /ˈraʊ.di/

Rowdy

Meaning
disorderly; unruly; noisy and disruptive
Example
The rowdy children were making too much noise.
C2 verb /rɪˈpaɪn/

repine

Meaning
To feel or express discontent or to long for something.
Example
She did not repine at her misfortune but worked harder to improve her life.
C1 noun/verb /rɪˈpriːz/

reprise

Meaning
A repetition or return to an earlier theme, role, or action.
Example
The actor reprised his role in the sequel.
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.
B1 noun rɪˌspɒnsəˈbɪlɪti

responsibility

Meaning
The state or fact of having a duty to deal with something or of having control over someone.
Example
Taking responsibility for one's actions is a sign of maturity.
C1 adjective /ˈrep.jə.tə.bəl/

Reputable

Meaning
having a good reputation; respected and trusted
Example
She works for a reputable law firm in the city.
B2 noun /rɪˈhɜːr.səl/

Rehearsal

Meaning
a practice performance of a play, concert, or other work for later public performance
Example
The final rehearsal before opening night went perfectly.
C2 noun /rɪˈsɪʒən/

rescission

Meaning
the cancellation or annulment of a law, contract, or agreement
Example
The rescission of the contract left both parties disappointed.
B2 verb /ˌriːəˈʃʊr/

reassure

Meaning
to say or do something to remove someone's doubts or fears
Example
The teacher reassured the students before the exam.
C1 verb rɪˈlɪŋ.kwɪʃ

relinquish

Meaning
To give up any authority, responsibility, or property.
Example
He decided to relinquish his position as CEO.
C1 verb /rɪˈsɜːrdʒ/

resurge

Meaning
To rise, increase, or become active again after a decline.
Example
Interest in traditional crafts has begun to resurge.
B1 noun /ˈref.ər.əns/

Reference

Meaning
the action of mentioning or alluding to something; a source of information
Example
Please provide references to support your research claims.
B2 adjective /ˈrændəm/

Random

Meaning
without pattern or predetermined order; happening by chance
Example
She selected a random book from the library shelf.
C1 noun /rɛnˈdɪʃən/

rendition

Meaning
a performance or interpretation of a piece of art, music, or text
Example
The singer gave a moving rendition of the classic song.
C1 noun /ˈriːpər/

reaper

Meaning
a person or machine that cuts and gathers crops
Example
The reaper moved slowly through the golden fields.
C1 noun /rɪˈkɜr.əns/

Recurrence

Meaning
the fact of something happening again; an instance of something happening again
Example
The doctor was concerned about the recurrence of the patient's symptoms.
C1 noun /rɪˈpʌlʃən/

Repulsion

Meaning
a feeling of intense distaste or disgust; a force under the influence of which objects tend to move away from each other
Example
She felt a strong repulsion towards the idea of eating insects.
B1 noun /ˈrʌbər/

rubber

Meaning
a tough elastic substance made from the latex of tropical plants or synthetically, used for making tires, boots, and other products.
Example
The tires are made of natural rubber.
C1 adjective /rɪˈdʒɛn.ə.rə.tɪv/

regenerative

Meaning
Able to restore or renew damaged environments, soil, or resources.
Example
Regenerative farming improves soil health and biodiversity.
C1 verb /rænt/

rant

Meaning
to speak or shout in an angry, uncontrolled way
Example
He ranted about the unfair treatment at work.
C1 noun /ˌriː.əˈdʒʌst.mənt/

readjustment

Meaning
The act of changing or correcting something again to make it suitable or balanced.
Example
After moving to a new city, he went through a period of readjustment.
A1 verb /rʌn/

run

Meaning
to move quickly on foot; to operate or function
Example
I run every morning for exercise.
B1 adjective /rɪˈlækst/

relaxed

Meaning
free from tension or stress; calm and comfortable
Example
She felt relaxed after listening to soft music.
C1 adjective /ˈrʌs.tɪk/

Rustic

Meaning
simple and unsophisticated; relating to rural areas
Example
The rustic cottage had wooden beams and a thatched roof.
C2 verb /ruː/

rue

Meaning
To feel regret or sorrow about something.
Example
She will rue the day she trusted him.
B2 verb /ˌriːprəˈdjuːs/

reproduce

Meaning
To make a copy of something; to generate offspring.
Example
Many animals reproduce rapidly in favorable conditions.
A2 noun /ruːl/

rule

Meaning
an accepted principle or instruction that states what is allowed or what must be done.
Example
There are strict rules about safety in the lab.
C2 noun /ˈrɛkluːsəri/

reclusory

Meaning
A place for seclusion or retreat, especially for a recluse or hermit.
Example
The monk spent years in the reclusory away from society.
C2 verb /rɪˈkjʊə/

recure

Meaning
to cure again; to remedy a second time
Example
The doctor had to recure the wound after it reopened.
C1 adjective /ˈræɡ.ɪd/

Ragged

Meaning
torn; tattered; frayed; shabby
Example
The homeless man wore ragged clothes.
B2 noun /ˈreɪ.dɑːr/

Radar

Meaning
a system for detecting the presence, direction, distance of aircraft, ships by sending out radio waves
Example
The radar detected an unknown aircraft approaching the base.
A1 noun ˈræbɪt

rabbit

Meaning
A small mammal with long ears, long hind legs, and a short tail
Example
The rabbit ran quickly into the forest.
B2 noun /rɪˈmaɪndər/

reminder

Meaning
something that helps you remember a fact, event, or action that you need to do or recall
Example
He set a reminder to call his mother on her birthday.
B1 noun /rɪsk/

Risk

Meaning
a situation involving exposure to danger; the possibility of something bad happening
Example
Taking this investment carries a high risk of losing money.
B2 noun /ˌriː.əˈʃʊr.əns/

Reassurance

Meaning
comfort or confidence given to someone to remove their fears or doubts
Example
She needed reassurance that everything would be okay.
C1 noun /rɪˈvɜːrʒən/

reversion

Meaning
the act of returning to a previous state or condition
Example
The new policy marked a reversion to traditional methods.
B2 adjective /ˈrɑː.ki/

Rocky

Meaning
full of rocks; unsteady; difficult
Example
The rocky path made hiking difficult for the tourists.
B2 noun /ˈrɪdəl/

Riddle

Meaning
a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning; a puzzle
Example
The ancient riddle stumped all the scholars for years.
B2 noun, verb /rɪˈzɔːrt/

resort

Meaning
A place for rest or recreation; to turn to something for help or solution.
Example
They stayed at a beach resort during their vacation.
C1 noun /ˈriːbeɪt/

rebate

Meaning
a partial refund given to someone who has paid too much money for something
Example
The store offered a rebate on bulk purchases.