Ripple
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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.
B1 noun rɪˈdʌk.ʃən

reduction

Meaning
The action or fact of making a specified thing smaller or less in amount, degree, or size.
Example
Greenhouse gas reduction is a primary global goal.
C1 noun /ˈrɛtɪsəns/

reticence

Meaning
the quality of being reserved or unwilling to speak freely
Example
His reticence made it difficult to know what he was thinking.
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 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.
B2 noun /rɪˈmeɪnz/

remains

Meaning
the parts, pieces, or substances that are left after the rest has been used or removed
Example
The remains of the meal were left on the table.
B1 noun ruːlz ənd ˌrɛɡjʊˈleɪʃənz

rules and regulations

Meaning
Official orders and laws that control how something is done.
Example
Rules and regulations alone cannot change attitudes.
C1 noun /rɪˈliːf treɪn/

Relief Train

Meaning
a train that carries emergency supplies and aid to disaster-affected areas
Example
The relief train arrived with food and medical supplies for the flood victims.
C1 noun /rɪˈfaɪnəri/

refinery

Meaning
an industrial facility where raw materials are processed and purified
Example
The oil refinery processes thousands of barrels daily.
C1 verb /riˈɪtəreɪt/

reiterate

Meaning
To say something again or repeatedly for emphasis or clarity.
Example
The teacher reiterated the importance of honesty.
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 /riːl/

reel

Meaning
to lose balance and stagger; to wind or spin something onto a reel
Example
He reeled backward after being punched.
B2 adjective /ˈrɪɡ.ər.əs/

rigorous

Meaning
Extremely thorough and demanding in analysis or practice.
Example
A rigorous study plan helps students achieve better results.
B1 noun /reɪ/

ray

Meaning
a narrow beam of light, heat, or radiation
Example
A ray of sunlight broke through the clouds.
B2 noun rɪsk ˈfæktər

risk factor

Meaning
Something that increases the likelihood of developing a disease or condition
Example
Water pollution is a significant risk factor for health.
C1 verb /ˌrɛzəˈrɛkt/

resurrect

Meaning
To bring back to life or revive something from the past.
Example
The director decided to resurrect the old play for a new audience.
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 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.
B1 noun /rɪˈkʌvəri/

recovery

Meaning
the process of recovering or returning to a normal state
Example
The patient is in recovery after the surgery.
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.
B2 adverb /ruːˈtiːnli/

routinely

Meaning
as part of a regular procedure; habitually
Example
The staff routinely checks the equipment for safety.
C1 adjective /ˈrɪvɪtɪŋ/

riveting

Meaning
extremely interesting; holding the complete attention
Example
The movie was so riveting that nobody looked away.
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.
A2 verb /rɪˈpiːt/

repeat

Meaning
to say or do something again
Example
Could you please repeat what you just said?
C1 noun /ˈruːbrɪk/

rubric

Meaning
A set of instructions, rules, or a heading in a document, often used for grading criteria.
Example
The teacher provided a grading rubric for the assignment.
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.
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.
C2 noun /roʊˈtʌn.də/

rotunda

Meaning
a large circular building or hall, often with a dome
Example
Tourists gathered inside the grand rotunda of the capitol.
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.
A2 adverb /ˈrɑː.ðər/

Rather

Meaning
to some extent; instead; preferably
Example
I would rather stay home than go to the party.
A2 verb /raɪz/

rise

Meaning
to move upward; to get up from bed; to increase
Example
The sun rises in the east.
A2 adjective /ˈriː.sənt/

Recent

Meaning
happening not long ago; new; current;
Example
The recent changes in weather patterns concern scientists.
B1 noun /rɪˈkwaɪə(r)mənt/

requirement

Meaning
something that is necessary or demanded
Example
The job has specific educational requirements.
B2 noun /rɛlm/

realm

Meaning
A kingdom or domain; a field or area of activity or interest.
Example
He is well known in the realm of science.
B1 adjective /rɪˈleɪ.tɪd/

Related

Meaning
connected; associated; having a connection or relationship
Example
These two problems are closely related to each other.
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 /ˈrɛdʒɪmənt/

regiment

Meaning
A permanent unit of an army, typically commanded by a colonel and divided into several companies.
Example
The regiment marched proudly through the streets after returning from the mission.
C2 noun /rɪˈfrækʃən/

refraction

Meaning
The bending of light, sound, or other waves when they pass from one medium to another of different density.
Example
The refraction of light in water makes objects appear bent.
B2 adjective /ˈroʊlɪŋ/

rolling

Meaning
moving in gentle undulations; moving forward by turning over and over
Example
They drove through the rolling hills of the countryside.
B2 adjective rəʊˈbʌst

robust

Meaning
Strong and healthy; vigorous; able to withstand or overcome adverse conditions.
Example
The robust infrastructure ensures reliable communication.
C2 verb /rɛtʃ/

retch

Meaning
to make the sound and movement of vomiting without bringing anything up
Example
The smell of spoiled food made him retch violently.
C1 noun /ˈrɛspɪt/

respite

Meaning
A short period of rest or relief from something difficult or unpleasant.
Example
The weekend provided a welcome respite from work.
B1 adverb /ˈrʌfli/

Roughly

Meaning
approximately; in a harsh or violent way
Example
The project will take roughly three months to complete.
C1 verb /ˈræʃənaɪz/

rationlize

Meaning
to justify or explain something with logical reasons, even if not appropriate or true
Example
He tried to rationlize his mistake by blaming the system.
C1 adjective /rɪˈzɪstɪv/

resistive

Meaning
tending to resist or oppose; in physics, relating to electrical resistance
Example
The material has resistive properties that slow down current flow.
C1 verb /rɪˈsɪprəˌkeɪt/

reciprocate

Meaning
To respond to an action or gesture by making a corresponding one.
Example
She smiled at him, and he reciprocated with a warm hug.
B2 verb /rɪˈzɪst/

resist

Meaning
to oppose or fight against; to withstand
Example
He could not resist the temptation.
A2 verb /roʊl/

roll

Meaning
to move by turning over and over on an axis
Example
She rolled the ball down the hill.
B2 noun /ˈruːdnəs/

Rudeness

Meaning
the quality of being impolite, discourteous, or offensive in behavior or speech
Example
His rudeness shocked everyone at the dinner party.
C2 noun /ˈrɒndoʊ/

rondo

Meaning
a musical composition with a recurring leading theme
Example
The pianist ended the recital with a lively rondo.
B2 adjective /rɪˈzɜːrvd/

Reserved

Meaning
slow to reveal emotion or opinions; restrained in manner
Example
She is quite reserved and doesn't talk much in meetings.
B2 verb /rɪˈtriːt/

retreat

Meaning
to move back or withdraw from a position or situation
Example
The soldiers had to retreat after losing the battle.
C1 noun /ˈroʊ.lɪŋ bɔːrd/

Rolling board

Meaning
a flat wooden or marble surface used for rolling out dough
Example
She placed the dough on the rolling board.
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 verb /rɪˈfreʃ/

refresh

Meaning
to make fresh again; to restore energy
Example
A cold drink refreshes me on hot days.
C1 noun /rɪˈpɔːrtɪʒ/

reportage

Meaning
the act of reporting news or describing events in the media
Example
The magazine is known for its detailed reportage of political issues.
C2 noun /rʌmp/

Rump

Meaning
the hindquarters or buttocks; the lower back area
Example
The horse injured its rump during the fall.
B1 noun /ˌrɛdʒɪˈstreɪʃən/

registration

Meaning
the action or process of enrolling or signing up for something
Example
The registration for the event will close tomorrow.
C1 noun /ˌrɛstɪˈtjuːʃən/

restitution

Meaning
The act of restoring something to its rightful owner or compensating for loss
Example
The court ordered restitution to the victims of the fraud.
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 /rɪˈfreʃ.mənt/

Refreshment

Meaning
food and drink that is served as a light meal; something that refreshes
Example
We served light refreshments after the meeting.
B2 verb rɪˈzaɪn

resign

Meaning
Voluntarily leave a job or other position.
Example
Ministers were forced to resign.
A2 verb /rɪˈdjuːs/

reduce

Meaning
to make smaller in size, amount, or degree; to decrease
Example
We need to reduce our expenses this month.
C1 noun, adjective /ˈrɛvərənd/

reverend

Meaning
A title of respect used for members of the clergy; deserving deep respect.
Example
The Reverend gave an inspiring sermon at the church.
C1 adjective /ˈrɛzənənt/

resonant

Meaning
Deep, clear, and continuing to sound or echo.
Example
The resonant voice of the speaker filled the hall.
C2 noun /ruːˈeɪ/

roue

Meaning
A man devoted to a life of sensual pleasure; a debauched man.
Example
The old roue squandered his fortune on gambling and women.
C1 noun ˈrez.ɪ.djuːz

residues

Meaning
A small amount of something that remains after the main part has gone or been taken or used.
Example
The burning process leaves no harmful residues.
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.
C1 noun /ˌrɛpəˈreɪʃən/

reparation

Meaning
the making of amends for a wrong done by paying money or helping those who were wronged
Example
The government offered reparations to the victims of the conflict.
B2 noun /ˈraɪvəl/

Rival

Meaning
a person or thing competing with another for the same objective or for superiority in the same field
Example
The two companies have been business rivals for decades.
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.
B2 noun /ˈrɔɪəlti/

royalty

Meaning
Members of a royal family or payment made to the owner of a patent, copyright, or natural resource.
Example
The author receives a royalty for every book sold.
C1 noun /ˈrɛtrəsˌpɛkt/

retrospect

Meaning
the act of looking back on or reviewing past events
Example
In retrospect, the decision seemed unwise.
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.
C2 adjective /ˈrɛpərəbəl/

reparable

Meaning
able to be repaired or fixed
Example
The damage to the car was serious but still reparable.
B2 adjective /ˈrɪdʒ.ɪd/

Rigid

Meaning
hard and stiff; not able to bend; strict and unwilling to change
Example
The company has a rigid dress code that all employees must follow.
B2 noun /ˌriː.ɪnˈfɔːrs.mənt/

reinforcement

Meaning
Strengthening or supporting something, especially behavior or learning.
Example
Positive reinforcement helps in learning.
C1 noun /ˈrɛz.ə.nəns/

resonance

Meaning
A deep, reverberating sound or a quality of evoking response.
Example
His speech had a deep resonance with the audience.
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.
A2 adjective /ˈrʌʃən/

russian

Meaning
relating to Russia, its people, or its language
Example
She is studying the Russian language at university.
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 adjective /ˈræmpənt/

rampant

Meaning
existing or spreading unchecked, often in an undesirable way
Example
Corruption was rampant in the city administration.
B2 verb /ˌriːprəˈdjuːs/

reproduce

Meaning
To make a copy of something; to generate offspring.
Example
Many animals reproduce rapidly in favorable conditions.
B1 adjective /ˈrʊr.əl/

Rural

Meaning
relating to the countryside; characteristic of farming or country life
Example
She grew up in a rural area far from the city.
A2 verb /rɪˈkwaɪər/

require

Meaning
to need something; to demand or insist on
Example
This job requires excellent communication skills.
C1 verb /rɪˈtreɪs/

retrace

Meaning
to go back over a path or route; to recall and repeat steps taken earlier
Example
She retraced her steps to find her lost keys.
A2 verb /rɪˈplaɪ/

reply

Meaning
to give an answer; to respond
Example
She replies to emails quickly.
B2 noun /raɪˈnɒs.ər.əs/

Rhinoceros

Meaning
a large, heavy animal with thick skin and one or two horns on its nose
Example
The rhinoceros charged through the grassland.
C1 verb /rɪˈvɪər/

revere

Meaning
To deeply respect or admire someone or something.
Example
The students revered their teacher for his wisdom.
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.
B2 noun /ræɡ/

Rag

Meaning
a piece of old cloth used for cleaning; worn-out clothing
Example
She used an old rag to clean the dusty table.
B1 noun /ˈrʌnər/

runner

Meaning
a person who runs, especially in races or for exercise
Example
The runner crossed the finish line with a big smile.
C1 adjective /ˈrɔːkəs/

raucous

Meaning
loud, harsh, and unpleasant sound or behavior
Example
The crowd became raucous after the team scored.
B2 noun /ˈruːmər/

rumor

Meaning
a currently circulating story or report of uncertain or doubtful truth.
Example
There’s a rumor that the company will merge next year.
C1 verb /rɒmp/

romp

Meaning
to play or move in a lively, carefree, and energetic way
Example
The children romped happily in the garden.
C1 noun /rɪˈdʒɔɪsɪŋ/

rejoicing

Meaning
The action of showing great joy or happiness
Example
There was much rejoicing after the victory.
B1 verb /rɪˈviːl/

reveal

Meaning
to make known or show something that was hidden
Example
The investigation revealed the truth.
A2 noun /reɪt/

rate

Meaning
the cost or price of something, or the amount at which something happens
Example
The rate of inflation is increasing every year.
C2 noun /ˈrɛk.tɪ.tjuːd/

rectitude

Meaning
Morally correct behavior or thinking; righteousness and integrity.
Example
His rectitude earned him respect in society.
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 verb /ˈrɪvɪt/

rivet

Meaning
to fasten or secure with a rivet; to hold someone’s attention firmly
Example
The craftsman riveted the metal plates together.
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.
C2 adjective /rɪˈsplɛndənt/

resplendent

Meaning
Shining brilliantly; dazzling in appearance or effect
Example
The bride looked resplendent in her wedding gown.
C2 adjective /ˈræfɪʃ/

raffish

Meaning
unconventional and slightly disreputable but attractive
Example
He had a raffish charm that made him popular in the city.
C2 adjective /rɪˈkʌmbənt/

recumbent

Meaning
lying down or in a resting position
Example
He was found recumbent on the sofa after a long day.
A2 noun /rɪˈlɪdʒ.ən/

religion

Meaning
a system of faith and worship involving belief in a higher power
Example
Freedom of religion is a fundamental human right.
A1 noun, verb /rɛst/

rest

Meaning
to cease work or movement in order to relax or recover strength
Example
He needs to rest after the long journey.
C2 adjective /ˈrɪz.ə.bəl/

risible

Meaning
so absurd or ridiculous that it deserves to be laughed at
Example
The idea of flying pigs is completely risible.
B2 adjective /rɪˈspɒn.sɪv/

Responsive

Meaning
reacting quickly and positively; readily reacting to suggestions or changes
Example
The website is very responsive and loads quickly on all devices.
B2 adjective /ˈrest.ləs/

Restless

Meaning
unable to rest or relax; constantly moving or fidgeting
Example
The child was restless during the long car journey.
C2 noun /rɪˈmɒnstrəns/

remonstrance

Meaning
A forceful protest or objection.
Example
The workers’ remonstrance against unfair treatment was ignored.
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.
B2 noun ˌrɛzɪɡˈneɪʃən

resignation

Meaning
The acceptance of something undesirable but inevitable; giving up.
Example
Her resignation from the position was unexpected.
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.
C2 noun /ˌræproʊʃˈmɑːn/

rapprochement

Meaning
The establishment or resumption of harmonious relations.
Example
The two countries signed an agreement that marked a new rapprochement.
B2 verb /rɪˈdʒɔɪs/

rejoice

Meaning
to feel or show great joy; to celebrate
Example
The family rejoices at the good news.
B2 noun /ræntʃ/

ranch

Meaning
a large farm where animals such as cattle or sheep are raised
Example
They own a huge cattle ranch in Texas.
C1 adjective /ˈræɡ.ɪd/

Ragged

Meaning
torn; tattered; frayed; shabby
Example
The homeless man wore ragged clothes.
B2 verb /rɪˈvoʊlt/

revolt

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

rape

Meaning
to force someone to have sexual intercourse without their consent
Example
The law strictly punishes those who commit rape.
B2 noun /ˌrezəˈveɪʃən/

Reservation

Meaning
the action of reserving something; an arrangement whereby something is reserved for a particular person; a qualification to an expression of agreement or approval
Example
I made a reservation at the restaurant for tonight.