Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Characterized by rapid motion; swift.
  • adj. Accomplished or arrived at without delay; prompt. See Synonyms at fast1.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Characterized by a rapid or swift motion.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not dilatory or slow; quick; swift; nimble; hasty; rapid in motion or performance

from The Century Dictionary and Cyclopedia

  • Successful; prosperous.
  • Marked by speed of movement; going rapidly; quick; swift; nimble; hasty; rapid: as, a speedy flight.
  • Rapidly coming or brought to pass; not deferred or delayed; prompt; ready.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. accomplished rapidly and without delay
  • adj. characterized by speed; moving with or capable of moving with high speed

Etymologies

From Middle English spedi, from Old English spēdiġ ("having good speed, lucky, prosperous; having means, wealthy, opulent, rich in material wealth; rich in, abounding in, abundant, plenteous, copious; powerful"), from Proto-Germanic *spōdigaz (“successful, hurried”), equivalent to speed +‎ -y. Cognate with Scots spedie ("speedy"), Dutch spoedig ("speedy, swift, rapid, quick"), German sputig, spudig ("industrious, speedy"). (Wiktionary)

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