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verb (used with object)
  1. Military. to spread out (troops) so as to form an extended front or line.
  2. to arrange in a position of readiness, or to move strategically or appropriately: to deploy a battery of new missiles.
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verb (used without object)
  1. to spread out strategically or in an extended front or line.
  2. to come into a position ready for use: the plane can't land unless the landing gear deploys.
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Origin of deploy

1470–80; < French déployer, equivalent to dé- dis-1 + ployer to fold; see ploy
Related formsde·ploy·a·ble, adjectivede·ploy·a·bil·i·ty, nounde·ploy·ment, nouncoun·ter·de·ploy·ment, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for deployable


verb mainly military
  1. to adopt or cause to adopt a battle formation, esp from a narrow front formation
  2. (tr) to redistribute (forces) to or within a given area
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Derived Formsdeployment, noun

Word Origin

C18: from French déployer, from Latin displicāre to unfold; see display
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for deployable



1786 as a military word, from French déployer "unroll, unfold," from Old French desploiier "unfold," from Latin displicare "unfold, scatter," from dis- (see dis-) + plicare "to fold" see ply (v.1)). "In its AFr. form regularly adopted in ME as desplay" [OED]. Related: Deployed; deploying.

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Online Etymology Dictionary, © 2010 Douglas Harper