Synonym: expeditious, fast, fleet, hasty, quick, speedy, swift. Antonym: slow. Similar words: rapidly, therapist, epidemic, capita, capital, a piece of, rape, trap. Meaning: ['ræpɪd] 
n. a part of a river where the current is very fast. adj. 1. done or occurring in a brief period of time 2. characterized by speed; moving with or capable of moving with high speed.
n. a part of a river where the current is very fast. adj. 1. done or occurring in a brief period of time 2. characterized by speed; moving with or capable of moving with high speed. 
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1, The 1990s were a period of rapid change/growth.
2, The gunman fired three times in rapid succession.
3, The patient made a rapid recovery.
4, He made such rapid progress.
5, There was a rapid increase in the internal trade.
6, They asked their questions in rapid succession.
7, He walked at a rapid pace along Charles Street.
8, His rise to power was very rapid.
9, There has been a rapid acceleration in the growth of industry.
10, The rapid movement of an object towards the eye triggers the blink reflex.
11, The rapid expansion of cities can cause social and economic problems.
12, Dee looked at the bill and made some rapid calculations.
13, His skin was dry and hot, his breathing rapid and jerky.
14, His arm was a rapid blur of movement as he struck.
15, Immersion in cold water resulted in rapid loss of heat.
16, Technological progress has been so rapid over the last few years.
17, Leonard made a rapid calculation: he'd never make it in time.
18, Childhood is a period of rapid growth.
19, By working hard he gained rapid promotion.
20, His rapid ascent in the social scale was surprising.
21, She did a rapid calculation in her head.
22, We heard the rapid crackle of automatic gunfire.
23, We live in an age of rapid technological advance.
24, His response to the accusation was rapid.
25, Her outstanding abilities were attested by her rapid promotion.
26, She had her first three children in rapid succession.
27, A cultural and social evolution now becomes rapid.
28, They pride themselves upon their child's rapid progress.
29, Liberty, when it begins to take root,(http://sentencedict.com/rapid.html) is a plant of rapid growth. 
30, The time has come for the firm to consolidate after several years of rapid expansion.
More similar words: rapidly, therapist, epidemic, capita, capital, a piece of, rape, trap, wrap, grape, therapy, wrap up, biography, photograph, photography, photographer, demographic.