R
- race - v. to run; to take part in a competition to decide who or what can move fastest; to take part in a campaign for political office; n. one of the major groups that humans can be divided into because of a common physical similarity, such as skin color
- radar - n. a device that uses radio signals to learn the position or speed of objects that may be too far away to be seen
- radiation - n. waves of energy from something that produces heat or light; energy from a nuclear substance, which can be dangerous
- radio - n. the system of sending and receiving signals or sounds through the air without wires
- raid - v. to make a sudden attack; n. a sudden attack carried out as an act of war, or for the purpose of seizing or stealing something
- railroad - n. a road for trains; a company that operates such a road and its stations and equipment
- rain - n. water falling from the sky
- raise - v. to lift up; to move to a higher position; to cause to grow; to increase
- rare - ad. not common; not usual; not often
- rate - n. speed; a measure of how quickly or how often something happens; the price of any thing or service that is bought or sold
- reach - v. to put a hand toward; to arrive at; to come to
- react - v. to act as a result of or in answer to
- read - v. to look at and understand the meaning of written words or numbers
- ready - ad. prepared; completed; organized; willing
- real - ad. true; truly existing; not false
- realistic - ad. in agreement with the way things are
- reason - n. the cause for a belief or act; purpose; something that explains
- reasonable - ad. ready to listen to reasons or ideas; not extreme; ready or willing to compromise
- rebel - v. to act against a government or power, often with force; to refuse to obey; n. one who opposes or fights against the government of his or her country
- receive - v. to get or accept something given, offered or sent
- recent - ad. a short time ago
- recession - n. a temporary reduction in economic activity, when industries produce less and many workers lose their jobs
- recognize - v. to know or remember something or someone that was known, known about or seen before; to accept another nation as independent and establish diplomatic ties with its government
- record - v. to write something in order to have it for future use; to put sound or pictures in a form that can be kept and heard or seen again; n. a writing that shows proof or facts about something
- recover - v. to get again something that was lost, stolen or taken away ("The police recovered the stolen money."); to return to normal health or normal conditions She is expected to recover from the operation.")
- red - ad. having the color like that of blood
- reduce - v. to make less or smaller in number, size or amount; to cut
- reform - v. to make better by changing; to improve; n. a change to a better condition
- refugee - n. a person who has been forced to flee because of unjust treatment, danger or war
- refuse - v. to reject; to not accept, give or do something
- regret - n. a feeling of sadness or sorrow about something that is done or that happens
- reject - v. to refuse to accept, use or believe
- relations - n. understandings or ties between nations; members of the same family; people connected by marriage or family ties
- release - v. to free; to permit to go; to permit to be known or made public
- religion - n. a belief in, or the honoring of, a god or gods
- remain - v. to stay in a place after others leave; to stay the same
- remains - n. a dead body
- remember - v. to think about the past; opposite forget
- remove - v. to take away or take off; to put an end to; to take out of a position or office
- repair - n. work done to fix something
- repeat - v. to say or do again
- report - v. to tell about; to give the results of a study or investigation; n. the story about an event; the results of a study or investigation; a statement in which the facts may not be confirmed
- represent - v. to act in the place of someone else; to substitute for; to serve as an example
- repress - v. to control or to restrict freedoms by force
- request - v. to ask for; n. the act of asking for
- require - v. to need or demand as necessary
- rescue - v. to free from danger or evil
- research - n. a careful study to discover correct information
- resign - v. to leave a position, job or office
- resist - v. to oppose; to fight to prevent
- resolution - n. an official statement of agreement by a group of people, usually reached by voting
- resource - n. anything of value that can be used or sold
- responsible - ad. having a duty or job to do ("He is responsible for preparing the report."); being the cause of ("They were responsible for the accident.")
- rest - v. to sit, lie down or sleep to regain strength; n. that which remains; the others
- restrain - v. to keep controlled; to limit action by a person or group
- restrict - v. to limit; to prevent from increasing or becoming larger
- result - v. to happen from a cause; n. that which follows or is produced by a cause; effect
- retire - v. to leave a job or position because one is old or in poor health
- return - v. to go or come back; to bring, give, take or send back
- revolt - v. to protest violently; to fight for a change, especially of government
- rice - n. a food grain
- rich - ad. having much money or goods; having plenty of something
- ride - v. to sit on or in and be carried along; to travel by animal, wheeled vehicle, airplane or boat
- right - n. what a person legally and morally should be able to do or have ("It is their right to vote."); ad. agreeing with the facts; good; correct; opposite wrong; on the side that is toward the east when one is facing north; opposite left
- riot - v. to act with many others in a violent way in a public place; n. a violent action by a large group of people
- rise - v. to go up; to go higher; to increase; to go from a position of sitting or lying to a position of standing
- risk - n. the chance of loss, damage or injury
- river - n. a large amount of water that flows across land into another river, a lake or an ocean
- road - n. a long piece of hard ground built between two places so people can walk, drive or ride easily from one place to the other
- rob - v. to take money or property secretly or by force; to steal
- rock - n. a hard piece of mineral matter
- rocket - n. a device shaped like a tube that moves through air or space by burning gases and letting them escape from the back or bottom, sometimes used as a weapon
- roll - v. to turn over and over; to move like a ball
- room - n. a separate area within a building with its own walls
- root - n. the part of a plant that is under the ground and takes nutrients from the soil
- rope - n. a long, thick piece of material made from thinner pieces of material, used for tying
- rough - ad. not flat or smooth; having an uneven surface; violent; not made well
- round - ad. having the shape of a ball or circle
- rub - v. to move something over the surface of another thing
- rubber - n. a substance made from the liquid of trees with the same name, or a similar substance made from chemicals
- ruin - v. to damage severely; to destroy
- rule - v. to govern or control; to decide; n. a statement or an order that says how something must be done
- run - v. to move quickly by steps faster than those used for walking