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R

race

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

a device that uses radio signals to learn the position or speed of objects that may be too far away to be seen

radiation

waves of energy from something that produces heat or light; energy from a nuclear substance, which can be dangerous

radio

the system of sending and receiving signals or sounds through the air without wires

raid

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

a road for trains; a company that operates such a road and its stations and equipment

rain

water falling from the sky

raise

to lift up; to move to a higher position; to cause to grow; to increase

rare

not common; not usual; not often

rate

speed; a measure of how quickly or how often something happens; the price of any thing or service that is bought or sold

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