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rapid eye movement sleep
See REM sleep.


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  • Rapid-fire

    [rap-id-fahyuh r] /ˈræp ɪdˈfaɪər/ adjective 1. characterized by, delivered, or occurring in rapid succession: rapid-fire questions; rapid-fire events. 2. Military. discharging in rapid fire: rapid-fire rifles. 3. discharging, operating, etc., at a rate more rapid than normal: a rapid-fire staple gun. noun, Military. 1. a rate of firing small arms that is intermediate between slow […]

  • Rapidity

    [ruh-pid-i-tee] /rəˈpɪd ɪ ti/ noun 1. a state or quality; quickness; celerity. n. 1650s, from French rapidité and directly from Latin rapiditatem (nominative rapiditas) “swiftness, rapidity, velocity,” from rapidus “hasty, swift, rapid” (see rapid).

  • Rapidly

    [rap-id] /ˈræp ɪd/ adjective, sometimes, rapider, rapidest. 1. occurring within a short time; happening speedily: rapid growth. 2. moving or acting with great speed; swift: a rapid worker. 3. characterized by speed: rapid motion. noun 4. Usually, rapids. a part of a river where the current runs very swiftly. /ˈræpɪd/ adjective 1. (of an action […]

  • Rapido

    [rah-pee-doh; Spanish rah-pee-th aw; Italian rah-pee-daw] /ˈrɑ piˌdoʊ; Spanish ˈrɑ piˌðɔ; Italian ˈrɑ pi dɔ/ noun, plural rapidos [rah-pee-dohz; Spanish rah-pee-th aws] /ˈrɑ piˌdoʊz; Spanish ˈrɑ piˌðɔs/ (Show IPA). Italian, rapidi [rah-pee-dee] /ˈrɑ pi di/ (Show IPA) (esp. in Spain, Italy, and Latin America) 1. an express train.

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