adj., -er, -est.

Moving, acting, or occurring with great speed. See synonyms at fast¹.

n.

An extremely fast-moving part of a river, caused by a steep descent in the riverbed. Often used in the plural.

[Latin rapidus, from rapere, to seize.]

rapidity ra·pid'i·ty (rə-pĭd'ĭ-tē) or rap'id·ness (răp'ĭd-nĕs) n.
rapidly rap'id·ly adv.

adjective

1. Characterized by great celerity: breakneck, expeditious, fast, fleet, quick, speedy, swift. Informal hell-for-leather. Idioms: quick as abunnywink. See fast/slow/velocity.
2. Accomplished in very little time: brief, expeditious, fast, flying, hasty, hurried, quick, short, speedy, swift. See fast/slow/velocity.

adj

Definition: very quick
Antonyms: languishing, leisurely, slack, slow

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IN BRIEF: Very swift or quick. Also: A part of a river where the water moves swiftly.

Liberty, when it begins to take root, is a plant of rapid growth. — George Washington (1732-1799)

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Dansk (Danish)
adj. - hurtig, stejl (skråning), følsom (film)
n. - vandfald, med stærk strøm

idioms:

• rapid eye-movement    REM (søvn)
• rapid transit    ekspres- (trafik)

Nederlands (Dutch)
snel, spoedig, scherp dalend (helling), (mv) stroomversnelling (meestal rotsachtig)

Français (French)
adj. - (gén) rapide
n. - les rapides

idioms:

• rapid eye movement    mouvement oculaire rapide
• rapid transit    (US, Transp) transport public

Deutsch (German)
adj. - schnell, rasch, rapide
n. - Blitzschnelle, Stromschnelle

idioms:

• rapid eye movement    REM (Augenbewegungen beim Schlafen)
• rapid transit    Schnellverkehr

Ελληνική (Greek)
adj. - γρήγορος, γοργός, ορμητικός, απότομος

idioms:

• rapid eye-movement    γρήγορη οφθαλμική κίνηση
• rapid transit    ταχείες αστικές συγκοινωνίες (υπόγειο, μετρό, υπερυψωμένος σιδηρόδρομος)

Italiano (Italian)
rapide, rapido

idioms:

• rapid eye-movement    rapido movimento oculare
• rapid transit    trasporto ad alta velocitý

Português (Portuguese)
adj. - rápido

idioms:

• rapid eye-movement    piscar de olhos
• rapid transit    trânsito veloz

Русский (Russian)
речной порог, быстрина, быстрый, скорый, крутой

idioms:

• rapid eye-movement    сон с быстрым движением глаз
• rapid transit    общественный транспорт

Español (Spanish)
adj. - rápido, muy empinado
n. - rápidos, rápido, muy empinado, rabión

idioms:

• rapid eye movement    movimiento rápido del ojo
• rapid transit    línea ferroviaria urbana, transporte público rápido

Svenska (Swedish)
adj. - hastig, strid

中文（简体） (Chinese (Simplified))
迅速的, 急促的, 飞快的, 急流, 高速交通网, 高速交通工具

idioms:

• rapid eye-movement    快速眼动
• rapid transit    高速交通系统, 都市捷运系统

中文（繁體） (Chinese (Traditional))
adj. - 迅速的, 急促的, 飛快的
n. - 急流, 高速交通網, 高速交通工具

idioms:

• rapid eye-movement    快速眼動
• rapid transit    高速交通系統, 都市捷運系統

한국어 (Korean)
adj. - 신속한, 날랜, 가파른
n. - 여울, 급류, 고속수송 열차

日本語 (Japanese)
adj. - 速い, 急な, 迅速な, すばやい, 敏捷な
n. - 早瀬, 高速輸送車

idioms:

• rapid eye-movement    急速眼球運動
• rapid transit    高速旅客輸送, 早指しチェス

العربيه (Arabic)
‏(صفه) سريع‏

עברית (Hebrew)
adj. - ‮מהיר, תלול‬
n. - ‮זרם נהר, אשד‬

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