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Children's Dictionary
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role the character played by an actor. [2 definitions]
role model a person whose actions set an example or are copied by others.
roll to move by turning over and over. [18 definitions]
roller a wheel attached to the bottom of a heavy object to make it easier to move. [4 definitions]
roller coaster an amusement park ride in which a train of open cars rides up and down a winding track.
roller skate a shoe, or frame that fits over a shoe, with four small wheels made for skating on a hard surface.
rolling the motion or sound of a thing that rolls. [3 definitions]
rolling pin a hard, smooth cylinder of wood or marble with handles at each end. It is used to roll out dough.
ROM computer memory that can only be read, not written to. "ROM" stands for "read-only memory."
Roman having to do with modern or ancient Rome or its people. [4 definitions]
Roman Catholic Church a Christian church that is headed by the pope, the bishop of Rome.
romance a love relationship, either in life or in literature or film. [4 definitions]
Romance language one of the modern languages that come from Latin. Italian, French, Spanish, and Portuguese are Romance languages.
Roman Empire the lands ruled by ancient Rome, stretching from Britain to North Africa and the Middle East.
Romania a European country between Hungary and the Black Sea. The capital of Romania is Bucharest.
Roman numeral a letter used as a number in the ancient Roman number system. The letter I equals 1, V equals 5, X equals 10, L equals 50, C equals 100, D equals 500, and M equals 1,000. In this system, a letter followed by one of equal or lesser value means the two are added; seven is VII, or 5+1+1. A letter followed by one of greater value means that the first is subtracted from the second; four hundred is CD, or 500-100.
romantic having to do with romance. [4 definitions]
Rome the capital city of Italy. [2 definitions]
romp to move about or play in a lively manner. [2 definitions]
roof the surface or covering on the top of a building. [2 definitions]
rook2 a chess piece that can move over any number of empty squares sideways or forward and backward; castle.