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rapid happening in a brief time. [4 definitions]
rapid eye movement the rapid back-and-forth and up-and-down movements of the eyes during the phases of sleep when dreaming occurs. (abbrev.:REM)
rapid-fire of guns, designed to fire shots in rapid succession. [2 definitions]
rapidity a state or quality characterized by quickness.
rapidly quickly; at a fast pace or in a short time.
rapid transit a system of metropolitan public transportation, such as a subway, that uses elevated and underground electric trains moving quickly and unimpeded through the city.
rapier a narrow-bladed, sharp-pointed sword used in the eighteenth century for thrusting. [2 definitions]
rapine the taking of property by force; robbery; plunder.
rappel the act of descending a sheer cliff or mountainside by means of a double rope around the body that allows the climber to control the rate of descent. [2 definitions]
rappen the centime of Switzerland.
rapper a door knocker. [3 definitions]
rapport a sympathetic or agreeable relationship; mutual affinity.
rapprochement the renewal or establishment of a friendly relationship, esp. between nations; state of reconciliation.
rapscallion a mischievous person; rascal.
rapt completely engrossed. [2 definitions]
raptor a bird of prey.
raptorial preying upon other animals; predatory. [3 definitions]
rapture extreme joy; ecstasy; bliss. [2 definitions]
rapture of the deep the early stage of nitrogen narcosis, a condition experienced by deep-sea divers under increased air pressure that resembles the sensation of intoxication.
rara avis rare bird (Latin); a rare, special, or unique person or thing.
rare1 happening very infrequently; uncommon. [4 definitions]