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rapid

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adjective American English pronunciation: rapid /ˈræpɪd/
  1. happening, moving, or acting quickly

    We are seeing a rapid growth in the use of the Internet.

    the rapid movement of troops into the area

derived words

rapidity

 American English pronunciation: rapidity /rəˈpɪdəti/  noun [uncountable]

rapidly

 American English pronunciation: rapidly  adverb

Business failures have risen rapidly in recent months.

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