Definitions

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

  • adv. In two cases or on two occasions; two times: I rewrote the essay twice.
  • adv. In doubled degree or amount: twice as many.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. Two times.

from the GNU version of the Collaborative International Dictionary of English

  • adv. Two times; once and again.
  • adv. Doubly; in twofold quantity or degree.

from The Century Dictionary and Cyclopedia

  • Two times; on two occasions; in two instances.
  • In twofold degree or quantity; doubly.
  • The second time; by or on a second trial, performance, etc.
  • Occurring twice.

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

  • adv. to double the degree
  • adv. two times

Etymologies

Middle English, from Old English twiga; see dwo- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From twi- meaning two or both. (Wiktionary)

Examples

  • I hadn't realised that C was still in the running though - it may require twice as many LOC, but it's ~twice as popular programmer wise?.

    OpenOffice.org Planet

  • It is evident, therefore, that each year an immense number of birds must perish -- as many in fact as are born; and as on the lowest calculation the progeny are each year twice as numerous as their parents, it follows that, whatever be the average number of individuals existing in any given country, _twice that number must perish annually_, -- a striking result, but one which seems at least highly probable, and is perhaps under rather than over the truth.

    Journal of the Proceedings of the Linnean Society - Vol. 3 Zoology

  • Adverting to a project for forming a railway to Woolwich, by which passengers were to be drawn by locomotive engines, moving with twice the velocity of ordinary coaches, the reviewer observed: — “What can be more palpably absurd and ridiculous than the prospect held out of locomotives travelling _twice as fast_ as stagecoaches!

    Lives of the Engineers The Locomotive. George and Robert Stephenson

  • A Profile of The Life and Death of Colonel Blimp, the all-male talking heads mention her name twice with no evaluation whatsoever of her performance.

    Penelope Andrew: Powell/Pressburger 1943 Classic Conjures Deborah Kerr's Early Artistry and Winston Churchill's Wrath

  • He hears Josh call his name twice and again the Russian's laughter before he reaches the door and then the light of the street.

    A Bear Hunt in Riga

  • The boss called my name twice from the threshold before I heard her.

    MY EMPIRE OF DIRT

  • That's a lot of scratch for pictures of Katherine Heigl getting Starbucks, but according to Kelly, the magazine is not only "lucrative" (he uses the term twice), but profitable as well:

    Us and She: Wenner Might Sell But Fuller Cashes In

  • Wilbur Carlisle had to say her name twice to gain her attention.

    Captive of My Desires

  • Doyler Doyle: had to take the name twice to be sure of it.

    At Swim, Two Boys

  • I had to call her name twice before she pocketed the bag and hurried over.

    The Commander

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