Radar
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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.
C1 noun /ˈrɪɡər/

rigor

Meaning
strictness, severity, or demanding conditions
Example
The training was carried out with great rigor.
B2 adjective rɪˈnaʊnd

renowned

Meaning
Known or talked about by many people; famous.
Example
The renowned scientist led the reform panel.
B2 noun /roʊst/

Roast

Meaning
Meat cooked by dry heat in an oven or over an open fire
Example
The Sunday roast was perfectly cooked and very tender.
C1 adjective /ˈroʊtəri/

rotary

Meaning
Relating to or characterized by rotation; revolving around an axis.
Example
The machine uses a rotary engine to function efficiently.
C1 verb /riːˈpeɪ.tri.eɪt/

repatriate

Meaning
To return someone to their own country, often after war or imprisonment.
Example
The government worked to repatriate the refugees safely.
C1 noun /ˈræʃən/

ration

Meaning
a fixed amount of something, especially food, officially allowed to each person
Example
During the war, each family received a weekly ration of rice.
B2 noun ˈrɛstɪŋ pleɪs

resting place

Meaning
A place where someone or something rests, especially a burial site.
Example
The resting place of the martyrs is near the river.
C1 noun ˈredʒ.ɪ.strɑːr

registrar

Meaning
An official responsible for keeping records or registers.
Example
The registrar oversees all administrative tasks.
B1 noun /rɪˈwɔːd/

reward

Meaning
something given in recognition of service, effort, or achievement
Example
He received a reward for returning the lost wallet.
B1 noun /rɪˈvɪʒ.ən/

Revision

Meaning
the action of revising; a revised edition or form of something; review of subject matter
Example
The students spent hours doing revision for their final exams.
B2 noun rɪˈkruːt.mənt

recruitment

Meaning
The action of finding new people to join an organization or support a cause.
Example
Recruitment strengthens the workforce.
C1 verb /rɪˈbʌf/

rebuff

Meaning
to reject or refuse in a sharp or abrupt way
Example
She rebuffed his invitation to dinner.
C2 adjective /ˈræfɪʃ/

raffish

Meaning
unconventional and slightly disreputable but attractive
Example
He had a raffish charm that made him popular in the city.
C1 noun /rɪˈdʒɪdəti/

Rigidity

Meaning
inability to bend or be forced out of shape; unwillingness to change or compromise
Example
The rigidity of the old system prevented any innovation.
B2 verb /ˌriː.kənˈsɪd.ər/

reconsider

Meaning
to think about something again, especially to change a decision or opinion
Example
She decided to reconsider her decision about moving abroad.
A2 adjective /ˈreɡ.jə.lər/

Regular

Meaning
happening at fixed intervals; consistent; normal; frequent
Example
She goes for regular exercise every morning at 6 AM.
C1 verb /rɪˈnaʊns/

renounce

Meaning
to formally declare rejection of something, such as a claim, belief, or way of life
Example
She renounced her citizenship to move abroad permanently.
C1 adjective /rɪˈdʌn.dənt/

redundant

Meaning
Not or no longer needed or useful; superfluous.
Example
The report contained redundant information.
B2 verb /ˌriːkriˈeɪt/

recreate

Meaning
to create or produce something again, especially a new version of something lost or destroyed
Example
The team recreated the lost dataset from backups.
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 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.
B2 noun /rɒd/

rod

Meaning
a thin straight bar, especially of metal or wood
Example
He used an iron rod to support the structure.
B2 noun ˌrev.əˈluː.ʃənz

revolutions

Meaning
Dramatic and wide-reaching changes in political, social, or economic systems, often involving the overthrow of a government or social order.
Example
Revolutions often lead to significant societal changes.
B1 noun ˌrek.ə.menˈdeɪ.ʃənz

recommendations

Meaning
Suggestions or proposals as to the best course of action.
Example
The commission submitted their recommendations.
B2 noun /rɪˈlʌk.təns/

Reluctance

Meaning
unwillingness to do something; hesitation
Example
He showed reluctance to accept the job offer.
B2 verb /ˈræl.i/

rally

Meaning
to come together for a common purpose or to recover strength or spirit
Example
The team rallied after halftime and won the match.
C1 noun /ˈræp.tʃər/

rapture

Meaning
A feeling of intense joy, delight, or ecstasy.
Example
She listened to the music in rapture.
C2 noun /ˈreɪmənt/

raiment

Meaning
clothing, especially fine or formal wear
Example
The king wore royal raiment during the ceremony.
C1 noun /ˈrɑːstər/

roster

Meaning
A list or plan showing people’s duties or times when they are scheduled.
Example
The manager updated the staff roster for next week.
C2 noun /ˈræpsədi/

rhapsody

Meaning
an expression of great enthusiasm or an epic musical composition
Example
The singer’s performance was a rhapsody of emotions.
B1 noun /rɪˈpɔːtɪŋ/

reporting

Meaning
the act of giving news or information about something
Example
Good reporting is essential for public awareness.
C1 verb rɪˈlɪŋ.kwɪʃ

relinquish

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

refinement

Meaning
The process of removing impurities or unwanted elements from a substance.
Example
His manners showed a refinement that made him stand out in any crowd.
C2 adjective /rɪˈdjuːsəbl̩/

reducible

Meaning
capable of being simplified, lessened, or made smaller
Example
The problem is complex but reducible to a few basic principles.
C1 adjective /rɪˈmoʊtɪd/

remoted

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

Rivalry

Meaning
competition for the same objective or for superiority in the same field; the state of being rivals
Example
The rivalry between the two teams made the match exciting.
B2 noun /reɪdʒ/

rage

Meaning
intense anger or fury
Example
She shouted in a fit of rage after hearing the news.
C1 noun /rɪˈpɑːzɪtɔːri/

repository

Meaning
a place where things are stored or kept for safekeeping
Example
The library serves as a repository of knowledge.
C1 noun ˌræʃ.ən.əl.ɪˈzeɪ.ʃən

rationalization

Meaning
The practice of finding reasons for behavior or actions that are not the real reasons.
Example
His rationalization of the mistake was not convincing.
B1 verb /rɪˈfɜː/

refer

Meaning
to mention or allude to something; to direct someone to a source of information
Example
Please refer to page 45 for more details.
A2 verb /ˈriːəlaɪz/

realize

Meaning
to become aware of; to understand clearly; to achieve or make real
Example
I didn't realize how late it was until I checked the clock.
B2 noun, verb /ræŋks/

ranks

Meaning
Positions within a group, especially in a hierarchy or organization.
Example
He quickly moved up the ranks of the army.
C1 noun /ˈreɪ.vən/

Raven

Meaning
a large, black bird with a thick bill and harsh croaking voice
Example
The raven perched on the old oak tree and cawed loudly.
C2 adjective /rɪˈfjuː.tə.bəl/

Refutable

Meaning
capable of being proven wrong or false; able to be disproved
Example
His theory was refutable because it could be tested experimentally.
B2 noun /ˌriː.ɪnˈfɔːrs.mənt/

reinforcement

Meaning
Strengthening or supporting something, especially behavior or learning.
Example
Positive reinforcement helps in learning.
C2 verb /rɪˈkænt/

recant

Meaning
to withdraw or renounce a statement or belief formally
Example
He recanted his previous statement in court.
B2 adverb /ˈræp.ɪd.li/

Rapidly

Meaning
at a fast speed; quickly
Example
The company is rapidly expanding into new markets.
A2 noun /ruːlz/

rules

Meaning
explicit principles or regulations governing conduct or procedure within a particular area of activity
Example
The teacher reminded the students to follow the classroom rules.
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 /ˈrɛlɪvənsi/

relevancy

Meaning
the quality of being closely connected or appropriate
Example
The professor questioned the relevancy of the example to the topic.
C2 noun /rɪˈfɛkʃən/

refection

Meaning
a meal or the act of taking food and drink
Example
The monks gathered for their evening refection.
B2 verb /rɪˈkʌvərɪŋ/

recovering

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

republican

Meaning
a member or supporter of a republican political party or system
Example
The republican candidate won the election.
A2 verb /riːtʃ/

reach

Meaning
to arrive at a destination; to extend one's arm to touch something
Example
We will reach the station in ten minutes.
B2 adjective /ˈrændəm/

Random

Meaning
without pattern or predetermined order; happening by chance
Example
She selected a random book from the library shelf.
B2 noun ˈrɛvənuː

revenue

Meaning
Income, especially when of a company or organization.
Example
The company's revenue grew by 10% this year.
A2 verb /rɪˈsiːv/

receive

Meaning
to get or accept something given; to welcome
Example
She receives a gift from her friend.
B2 noun /ˈriːteɪlər/

retailer

Meaning
a person or business that sells goods to consumers rather than to other businesses
Example
The retailer offers discounts on electronic products.
B2 verb /rɪˈɡeɪn/

regain

Meaning
to get back something that was lost; to recover
Example
He regains his strength after the illness.
C2 noun /ˈrɛlɪkwɛri/

reliquary

Meaning
a container for holy relics
Example
The ancient reliquary was decorated with gold and precious stones.
C2 verb /rɪˈɡeɪl/

regale

Meaning
To entertain or amuse someone with stories, food, or drink.
Example
He regaled us with stories of his travels around the world.
C1 adjective /ˈrɔːkəs/

raucous

Meaning
loud, harsh, and unpleasant sound or behavior
Example
The crowd became raucous after the team scored.
C2 adjective /raɪˈpɛə.ri.ən/

riparian

Meaning
Relating to or situated on the banks of a river or other watercourse.
Example
Riparian vegetation helps prevent soil erosion along rivers.
B2 noun /ˈruːlɪŋ/

ruling

Meaning
an official decision made by a judge or authority.
Example
The court’s ruling favored the defendant.
C1 adjective /rɪˈpliːt/

replete

Meaning
Filled or well-supplied with something; abundantly full.
Example
The book is replete with fascinating historical details.
C1 noun /ˌrek.ənˌsɪl.iˈeɪ.ʃən/

reconciliation

Meaning
The restoration of friendly relations; the action of making one view or belief compatible with another.
Example
The peace treaty was a major step toward reconciliation.
B2 verb /ˈreɡjəleɪt/

regulate

Meaning
to control or maintain according to rules or laws
Example
The government regulates food safety.
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.
C1 noun /ˈraɪtʃəsnəs/

righteousness

Meaning
the quality of being morally right or justifiable
Example
His life was dedicated to righteousness and truth.
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 verb /rɪˈmjuːnəreɪt/

remunerate

Meaning
To pay someone for services or work done.
Example
The company will remunerate employees fairly for their overtime.
B2 adjective /rɪˈlaɪ.ənt/

reliant

Meaning
depending on someone or something for support
Example
The country is too reliant on imported goods.
B2 adjective /rɪˈsɔːrsfəl/

resourceful

Meaning
Having the ability to find quick and clever ways to overcome difficulties.
Example
She is very resourceful when it comes to solving unexpected problems.
B2 noun /reɪk/

Rake

Meaning
a garden tool with a long handle and prongs for gathering leaves; to gather with a rake
Example
He used a rake to gather the fallen autumn leaves.
C2 adjective /ˈreɪ.moʊs/

ramose

Meaning
having many branches.
Example
The ramose tree shaded the entire garden.
C2 noun /ˌrep.ɑːˈtiː/

Repartee

Meaning
conversation or speech characterized by quick, witty comments or replies
Example
The dinner party was filled with brilliant repartee between the guests.
C1 noun /ˈræftər/

rafter

Meaning
One of the sloping beams that supports a roof.
Example
The old barn’s rafters were exposed.
B2 noun, verb /ræmp/

ramp

Meaning
a sloping surface joining two different levels; as a verb, to increase or rise sharply
Example
The car drove up the ramp into the parking garage.
C2 verb /rɪˈfrækt/

refract

Meaning
To bend light, sound, or heat as it passes through a medium.
Example
The water refracts light, making the straw look bent.
B1 noun /rɪˈspɒns/

Response

Meaning
a reaction to something; an answer or reply; the way in which something reacts to external stimulus
Example
The government's response to the crisis was swift and decisive.
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.
C1 verb /riˈɪtəreɪt/

reiterate

Meaning
To say something again or repeatedly for emphasis or clarity.
Example
The teacher reiterated the importance of honesty.
B1 noun /ˌrep.rɪˈzen.tə.tɪv/

representative

Meaning
A person chosen or appointed to act or speak for another or others.
Example
The representative addressed critical issues.
A1 noun /ˈrɛst(ə)rɒnt/

restaurant

Meaning
a place where meals are prepared and served to customers
Example
We went to the restaurant for dinner.
C1 noun/verb /reɪn/

rein

Meaning
A strap used to control a horse; to control or guide something.
Example
The rider pulled the rein to stop the horse.
B2 verb /riːˈɔːrɡənaɪz/

reorganize

Meaning
to arrange something again in a different way for greater efficiency or order
Example
The manager decided to reorganize the team structure.
C2 verb /ˈreə.rɪ.faɪ/

rarefy

Meaning
To make something less dense or more refined.
Example
The air rarefies as you climb higher into the mountains.
B1 noun rɪˈsɜː.tʃəz

researchers

Meaning
People who study and investigate to discover new information or facts.
Example
Researchers are working on innovative solutions.
C2 adjective /rəˈʃɛrʃ/

recherche

Meaning
Rare, exotic, or obscure, often in a sophisticated or refined way.
Example
The gallery displayed many recherche artworks from unknown artists.
C2 noun /rɪˌnʌnsiˈeɪʃən/

renunciation

Meaning
the formal rejection or giving up of something, usually a belief, claim, or way of life
Example
His renunciation of worldly pleasures impressed the monks.
C1 adjective /rɪˈsɛsɪv/

recessive

Meaning
In genetics, relating to a trait that is expressed only when two copies of the gene are present.
Example
Blue eye color is often a recessive trait.
B2 adjective /ˈreɪʃəl/

racial

Meaning
relating to a race of people
Example
Racial equality is an important issue in many societies.
B2 adjective /ˈrɑː.ki/

Rocky

Meaning
full of rocks; unsteady; difficult
Example
The rocky path made hiking difficult for the tourists.
C2 verb /ˈræm.ɪ.faɪ/

ramify

Meaning
to spread or branch out into divisions or subdivisions.
Example
The river ramifies into several smaller streams.
C2 noun /rɪˈvaɪ.zəl/

revisal

Meaning
The act of revising, reviewing, or making changes to something.
Example
The revisal of the contract took longer than expected.
A2 verb /riːˈsaɪ.kəl/

recycle

Meaning
to process used materials so they can be used again instead of being thrown away
Example
We should recycle paper and plastic to reduce waste.
C1 noun /rɪˌdʒuːvəˈneɪʃən/

rejuvenation

Meaning
The process of restoring something to a former better state, especially referring to renewing soil fertility or revitalizing agricultural land through various restoration practices.
Example
Rejuvenation of soil is necessary for sustainable agriculture.
C1 verb /rɪˈsiːd/

recede

Meaning
To move back or further away from a previous position.
Example
The floodwaters began to recede after the heavy rain stopped.
B1 noun /rɪˈfjuːz/

Refuse

Meaning
waste material; garbage; to decline or reject something
Example
Please put the refuse in the designated bins.
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 adjective /ˈrɒt.ən/

Rotten

Meaning
decayed; spoiled; bad
Example
The apple is rotten and should be thrown away.
B2 noun /ˈroʊ.lɪŋ pɪn/

Rolling pin

Meaning
a cylindrical tool used for rolling out dough or pastry
Example
Roll the dough flat with a rolling pin.
B1 verb /rɪd/

rid

Meaning
to remove or get rid of something
Example
I need to rid the house of all the clutter.
B2 adjective /ˈrʌn daʊn/

run-down

Meaning
in a poor condition; worn out or neglected
Example
They live in a run-down house at the edge of town.
B1 adjective /ˈrel.ə.vənt/

Relevant

Meaning
closely connected or appropriate to what is being discussed; pertinent
Example
Please provide only relevant information for this discussion.
C1 adjective /ˌruː.dɪˈmen.tər.i/

Rudimentary

Meaning
basic; elementary; undeveloped; in the earliest stage of development
Example
She has only rudimentary knowledge of French.
C2 noun /ˌrɛprɪˈhɛnʃən/

reprehension

Meaning
The act of rebuking or criticizing severely.
Example
The teacher’s reprehension of the student’s behavior was justified.
A2 adjective /ˈriː.sənt/

Recent

Meaning
happening not long ago; new; current;
Example
The recent changes in weather patterns concern scientists.
C1 adjective /rɪˈflek.sɪv/

Reflexive

Meaning
directed back on itself; showing deep thought about oneself
Example
She became more reflexive about her behavior after the feedback.
C1 adjective /riˈæk.tɪv/

Reactive

Meaning
responding to situations rather than initiating them; chemically active
Example
The company took a reactive approach to customer complaints.
A1 noun /roʊd/

road

Meaning
a wide way leading from one place to another
Example
We drove along the road to the village.
C1 noun /ˈrɛnɪˌɡeɪd/

renegade

Meaning
a person who deserts or betrays an organization, country, or principles
Example
He was labeled a renegade after leaving the party and criticizing its policies.
C1 noun /ˈrəʊ.bɒt əˈsɪs.tɪd prəˈsiː.dʒərz/

robot-assisted procedures

Meaning
Medical operations performed with the help of robotic systems to enhance precision and control.
Example
Robot-assisted procedures reduce human error.
C1 adjective /ˈreɡ.jʊ.lə.tər.i/

Regulatory

Meaning
Having the power to control or govern something through rules and regulations.
Example
The government enforces regulatory policies for financial stability.
C1 adjective /ˈrek.wɪ.zɪt/

Requisite

Meaning
made necessary by particular circumstances; required
Example
Good communication skills are requisite for this job.
A2 preposition /riː/

re

Meaning
concerning or about (used in formal letters or emails)
Example
The letter was sent re your recent application.
C1 verb /ˌriːhəˈbɪlɪteɪt/

rehabilitate

Meaning
to restore someone to health, normal life, or a good condition after illness, injury, or imprisonment
Example
The clinic helps rehabilitate injured athletes.
C1 adjective rɪˈsɛʃ.ən.er.i

recessionary

Meaning
Relating to or characterized by economic recession.
Example
Governments introduce policies to counter recessionary effects.
B2 verb /rɪˈfreʃ/

refresh

Meaning
to make fresh again; to restore energy
Example
A cold drink refreshes me on hot days.