reflector
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C1 noun /rɪˈflɛktər/

reflector

Meaning
A surface or device that reflects light, heat, or sound, often used to direct beams or improve visibility.
Example
The cyclist attached a red reflector to the back of his bike for safety.
B2 verb /rɪˈvɜːrt/

revert

Meaning
to return to a previous state, condition, or practice
Example
The system will revert to its original settings after the update.
C1 noun rɪˌdʒɛnəˈreɪʃən

regeneration

Meaning
Renewal, growth and development of cells, tissues or energy
Example
Proper rest allows muscle regeneration after exercise.
B1 noun rɪˈsɜː.tʃəz

researchers

Meaning
People who study and investigate to discover new information or facts.
Example
Researchers are working on innovative solutions.
C1 adjective /ˌrɛprɪˈhɛnsəbl̩/

reprehensible

Meaning
Deserving strong criticism or blame.
Example
His dishonest actions were truly reprehensible.
C1 verb /ˈrætɪfaɪ/

ratify

Meaning
to approve or confirm something officially, usually by law or formal consent
Example
The government ratified the trade agreement.
C1 verb /rɪˈtælieɪt/

retaliate

Meaning
to make an attack in return for a similar attack
Example
The army retaliated after the enemy attack.
B2 adjective /ˈruː.tɪd/

Rooted

Meaning
deeply established; firmly fixed
Example
His beliefs are deeply rooted in tradition.
C2 noun, adjective, verb /ˈrɛprəˌbeɪt/

reprobate

Meaning
A person of immoral character; to express disapproval of; morally corrupt.
Example
The old reprobate spent his days gambling and drinking.
C1 adjective /ˈræmpənt/

rampant

Meaning
existing or spreading unchecked, often in an undesirable way
Example
Corruption was rampant in the city administration.
A1 verb /raɪd/

ride

Meaning
to travel on or in a vehicle; to sit on and control a horse
Example
She likes to ride her bicycle to work.
B2 noun /rɪˌlaɪəˈbɪləti/

reliability

Meaning
the quality of being trustworthy or performing consistently well
Example
Customers value the reliability of our service.
C1 verb /raʊz/

rouse

Meaning
To awaken from sleep or to stir into action.
Example
The loud alarm roused him from his deep sleep.
B2 noun ˌreɪ.di.oʊ.ækˈtɪv.ə.ti

radioactivity

Meaning
The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
Example
Radioactivity is used in medical treatments like cancer therapy.
B1 noun /rɪˈkwaɪə(r)mənt/

requirement

Meaning
something that is necessary or demanded
Example
The job has specific educational requirements.
A2 noun /rɪˈzʌlt/

result

Meaning
a consequence, effect, or outcome of something
Example
The result of the test was excellent.
C2 noun /ˈrɛkjʊzənt/

recusant

Meaning
a person who refuses to submit to authority or comply with rules
Example
The recusant opposed the new law.
C2 verb /rɪˈtrɛntʃ/

retrench

Meaning
to reduce costs, spending, or staff to save resources
Example
The company had to retrench employees due to financial difficulties.
B1 noun /ruːˈtiːn/

routine

Meaning
A sequence of actions regularly followed; a fixed program.
Example
A well-structured routine improves productivity.
B2 verb /ˈrʌm.bəl/

rumble

Meaning
to make a continuous deep, resonant sound
Example
Thunder rumbled in the distance.
A2 noun /rent/

Rent

Meaning
a payment made periodically by a tenant to a landlord for use of property
Example
The monthly rent for this apartment is quite affordable.
B1 noun rɔː mətɪˈrɪəlz

raw materials

Meaning
The basic material from which a product is made.
Example
The factory imports raw materials for production.
A1 adjective /ˈreɪ.di.əʊ/

radio

Meaning
Relating to radio waves or broadcasting.
Example
FAST is the largest radio telescope in the world.
C2 noun /ˌrɛtroʊˈɡrɛʃən/

retrogression

Meaning
a return to a worse or less developed state
Example
The country experienced economic retrogression after the crisis.
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 /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.
A1 noun /ruːm/

room

Meaning
A space within a building enclosed by walls, floor, and ceiling
Example
She decorated her room with bright colors.
C1 noun /rʌsk/

Rusk

Meaning
a hard, dry biscuit or twice-baked bread; a type of crisp, sweet biscuit
Example
The baby enjoyed eating the soft rusk with milk.
C2 adjective /rɪˈkæl.sɪ.trənt/

recalcitrant

Meaning
Having an obstinately uncooperative attitude toward authority or discipline.
Example
The recalcitrant student refused to follow rules.
A1 adjective /red/

Red

Meaning
having the color of blood or fire; of the color red
Example
She wore a beautiful red dress to the party.
C1 noun /roʊz ˈber.i/

Rose berry

Meaning
a type of berry with rose-like characteristics or flavor
Example
The rose berry has a delicate floral taste that reminds me of roses.
C1 verb /ˈrɛlɪɡeɪt/

relegate

Meaning
to assign to a lower rank, position, or category
Example
The manager decided to relegate the player to the bench.
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 adjective /ˈræʃ.ən.əl/

Rational

Meaning
based on reason and logic; sensible and practical
Example
She made a rational decision based on the available facts.
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 verb /rɪˈfaɪn/

refine

Meaning
to improve by making small changes; to purify
Example
The chef refines the recipe to perfection.
C1 adjective /raɪf/

rife

Meaning
widespread or common, often in a negative sense
Example
Corruption was rife in the old government system.
C2 adjective /rɪˈfræɡəbəl/

refragable

Meaning
Capable of being refuted or disproved.
Example
His argument was weak and easily refragable.
B2 verb /rɪˈkʌvərɪŋ/

recovering

Meaning
the process of getting better after illness, loss, or difficulty
Example
She is still recovering from the flu.
A2 adverb /ˈrɛə(r)li/

rarely

Meaning
not often, infrequently
Example
She rarely eats sweets because of her diet.
A2 adverb /ˈrɑː.ðər/

Rather

Meaning
to some extent; instead; preferably
Example
I would rather stay home than go to the party.
B1 noun /ˈrʌbɪʃ/

Rubbish

Meaning
waste material; refuse or litter; nonsense or worthless things
Example
Please throw the rubbish in the bin.
A2 noun, verb /ˈriːzən/

reason

Meaning
A cause, explanation, or justification for an action or event; to think or argue logically.
Example
There is no reason to be upset.
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.
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.
C1 noun /rɪˈspɒnsɪvnəs/

responsiveness

Meaning
The quality of reacting quickly and positively
Example
The manager appreciated her responsiveness to customer feedback.
B2 noun ˌriːkənˈstrʌkʃn

reconstruction

Meaning
The action or process of reconstructing or being reconstructed.
Example
The reconstruction project took years.
C1 noun /rɪˈdʒɔɪsɪŋ/

rejoicing

Meaning
The action of showing great joy or happiness
Example
There was much rejoicing after the victory.
A2 noun rɪˈpɔːt

report

Meaning
An account given of a particular matter, especially in the form of an official document after thorough investigation or consideration.
Example
The report highlights critical issues.
C1 verb /ˌrekəˈlekt/

recollect

Meaning
to remember something; to recall from memory
Example
I can't recollect where I put my keys.
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.
C2 noun /ˌriːkəˌpɪtjʊˈleɪʃən/

recapitulation

Meaning
The act of summarizing or repeating the main points of something.
Example
The professor gave a brief recapitulation of the lecture before ending the class.
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.
B2 noun /ˈrep.taɪl/

Reptile

Meaning
a cold-blooded animal with scaly skin that lays eggs on land
Example
The lizard is a common reptile found in gardens.
C2 adjective /ræpˈtɔːriəl/

raptorial

Meaning
Relating to birds of prey or predatory behavior.
Example
The eagle is a raptorial bird with sharp talons.
B2 adjective /rɪˈfreʃ.ɪŋ/

Refreshing

Meaning
making one feel energized and renewed; pleasantly new or different
Example
The cool breeze was refreshing after the hot day.
C1 verb /rɪˈmɪt/

remit

Meaning
To send money in payment or as a gift; to cancel or refrain from exacting a debt or punishment.
Example
He promised to remit the payment by the end of the week.
C1 adjective /ˈræɡ.ɪd/

Ragged

Meaning
torn; tattered; frayed; shabby
Example
The homeless man wore ragged clothes.
C1 adjective /ˈrɛtroʊˌɡreɪd/

retrograde

Meaning
moving backward or returning to a worse condition
Example
The policy was seen as a retrograde step for human rights.
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.
B2 verb /rɪˈzaɪd/

reside

Meaning
to live or dwell in a particular place
Example
They reside in a large house near the river.
B2 verb /rɪˈzɪst/

resist

Meaning
to oppose or fight against; to withstand
Example
He could not resist the temptation.
C2 adjective /rɪˈmjuːnərətɪv/

remunerative

Meaning
Financially rewarding or profitable.
Example
He chose a remunerative career in medicine.
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.
C2 adjective /rɪˈmɪs/

remiss

Meaning
Negligent in performing a duty or responsibility.
Example
The manager was remiss in not checking the financial reports carefully.
B1 verb /rʌb/

rub

Meaning
to press and move something firmly against a surface; to apply pressure with movement
Example
She rubbed her hands together to keep them warm.
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.
C1 noun /rɪˈsaɪtər/

reciter

Meaning
a person who recites or repeats something aloud from memory, especially poetry, prayers, or formal texts
Example
The reciter delivered the poem with clarity and emotion.
C1 noun /rɪˈspɒndənt/

respondent

Meaning
A person who replies to something, especially in a survey or legal case
Example
The survey had over 1,000 respondents.
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.
C1 adjective /rɪˈpres.ɪv/

Repressive

Meaning
restraining freedom or preventing self-expression; oppressive
Example
The repressive government banned all forms of protest.
B2 noun /rɪˈlaɪ.əns/

Reliance

Meaning
the state of depending on something or someone for support or help
Example
His reliance on technology is concerning.
B1 noun /ˈreɪlˌroʊd/

railroad

Meaning
a track or system of tracks made of steel rails along which trains run
Example
The railroad connects the city to several nearby towns.
B2 adjective /ˈrɒt.ən/

Rotten

Meaning
decayed; spoiled; bad
Example
The apple is rotten and should be thrown away.
B1 adjective /ˈrɔɪ.əl/

Royal

Meaning
belonging to or connected with the monarch or monarchy; magnificent; excellent
Example
The royal family attended the ceremony.
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.
B1 noun /ˈrɪðəm/

rhythm

Meaning
a strong, regular, repeated pattern of movement or sound
Example
The rhythm of the music made everyone want to dance.
C2 verb /ˈrɔɪstər/

roister

Meaning
to revel noisily; to engage in loud, boisterous celebration
Example
The fans roistered in the streets after the victory.
B2 adjective /ˈræp.ɪd/

Rapid

Meaning
happening in a short time or at a fast pace
Example
The rapid growth of technology has changed our daily lives.
C2 noun /ˈrɪp.lɪt/

ripplet

Meaning
a small or tiny ripple
Example
Tiny ripplets appeared on the lake as the fish moved.
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 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 /ˈriːzənɪŋ/

reasoning

Meaning
the process of thinking about something in a logical way in order to form a conclusion or judgment
Example
Her reasoning for leaving was clear and logical.
B2 noun/verb rɪˈfɔːm

reform

Meaning
Make changes in (something, typically a social, political, or economic institution or practice) in order to improve it.
Example
Reform in the education system was a priority.
B1 verb /rɪˈɡɑːrd/

regard

Meaning
to consider or think of in a particular way; to look at
Example
She regards him as her best friend.
B2 verb /ˌriː.ɪnˈfɔːrs/

reinforce

Meaning
To strengthen or support something with additional material, people, or effort.
Example
The teacher used examples to reinforce the lesson.
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 adjective /ˈrʌɡ.ɪd/

Rugged

Meaning
rough and uneven; having a rough irregular surface; tough and strong
Example
The hikers crossed the rugged mountain terrain.
B2 noun, verb /ˈrætəl/

rattle

Meaning
to make a rapid series of short, sharp sounds; a device or object that makes such a sound
Example
The loose window began to rattle in the strong wind.
C2 noun /ˈrɒndoʊ/

rondo

Meaning
a musical composition with a recurring leading theme
Example
The pianist ended the recital with a lively rondo.
B2 noun /rɪˈmuː.vəl/

Removal

Meaning
the action of taking something away or eliminating it; dismissal from office
Example
The removal of the old furniture took all day.
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 adjective /rɪˈtɔːrɪkəl/

rhetorical

Meaning
relating to the art of effective or persuasive speaking or writing; often a question asked to make a point rather than get an answer
Example
He asked a rhetorical question during the debate.
B2 adjective ˌriːprəˈdʌktɪv

reproductive

Meaning
Relating to the reproduction of offspring.
Example
The reproductive cycle of pests can cause rapid infestations.
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.
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 /ˌriːəˈfɜːrm/

reaffirm

Meaning
To state again strongly; to confirm or strengthen a statement or belief.
Example
The president reaffirmed his commitment to education reform.
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.
C2 noun /ˌræʃioʊsɪˈneɪʃən/

ratiocination

Meaning
the process of reasoning or logical thinking
Example
His ratiocination impressed the judges during the debate.
C1 adjective /ˈroʊ.ɡɪʃ/

Roguish

Meaning
mischievous; playfully dishonest
Example
His roguish smile suggested he was up to some mischief.
C1 verb /ˈrævɪdʒ/

ravage

Meaning
to cause severe and extensive damage or destruction
Example
The hurricane ravaged the coastal villages.
B2 noun /rɪˈsɛs/

recess

Meaning
A short break from work or school; also a small space set back in a wall.
Example
The children played outside during recess.
C1 noun /rɪˈbʌtəl/

rebuttal

Meaning
a statement or argument made to oppose or disprove another
Example
Her rebuttal was clear and convincing.
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.
B1 noun riˈækʃən

reaction

Meaning
An action performed or a feeling experienced in response to a situation or event.
Example
The arrests triggered a reaction.
A2 verb /ˈrɛkəɡnaɪz/

recognize

Meaning
To identify someone or something seen before; to acknowledge or accept.
Example
She did not recognize him in the crowd.
B1 verb /rɪˈspɒnd/

respond

Meaning
to give an answer or reply; to react to something
Example
Please respond to my email as soon as possible.
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 /rɪˈlɛnt/

relent

Meaning
to become less severe, harsh, or strict
Example
After hours of begging, she finally relented.
B2 noun /ˈreɪsɪzəm/

racism

Meaning
the belief that some races are superior to others, leading to unfair treatment or prejudice
Example
The organization works to eliminate racism in all forms.
B2 adjective /rɪˈlaɪ.ənt/

reliant

Meaning
depending on someone or something for support
Example
The country is too reliant on imported goods.
C2 noun /rɪˈmɒnstrəns/

remonstrance

Meaning
A forceful protest or objection.
Example
The workers’ remonstrance against unfair treatment was ignored.
B2 verb /rɪˈzuːm/

resume

Meaning
to start again after a pause or interruption
Example
We will resume the meeting after lunch.
C1 adjective /rɪˈkʌr.ənt/

Recurrent

Meaning
happening repeatedly; occurring again and again; periodic;
Example
She has been suffering from recurrent headaches for months.
C2 noun /rɪˈvaɪlər/

reviler

Meaning
a person who criticizes or insults others abusively
Example
He was known as a reviler of all who opposed him.
B2 noun rɪˈpʌb.lɪk

republic

Meaning
A state in which supreme power is held by the people and their elected representatives, with an elected or nominated president rather than a monarch.
Example
A republic is governed by representatives of the people.
C1 noun /ræmˈbuːtən/

Rambutan

Meaning
a tropical fruit with red spiky skin and white translucent sweet flesh similar to litchi
Example
The rambutan looks scary with its hairy skin but tastes very sweet inside.
B1 verb rɪˈdjuːst

reduced

Meaning
Make smaller or less in amount, degree, or size.
Example
Singapore has reduced plastic usage significantly.
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.
B2 noun ˌrɛzɪɡˈneɪʃən

resignation

Meaning
The acceptance of something undesirable but inevitable; giving up.
Example
Her resignation from the position was unexpected.
C1 noun/verb /rɪˈpoʊz/

repose

Meaning
a state of rest, sleep, or tranquility; to rest or lie in a peaceful position
Example
After the long journey, she sought repose in the quiet garden.