2 [fleks]
Informal. flexible: a flex program of workers' benefits.

shortening of flexible

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World English Dictionary
flex (flɛks)
1.  (Brit) US and Canadian name: cord a flexible insulated electric cable, used esp to connect appliances to mains
2.  informal flexibility or pliability
3.  to bend or be bent: he flexed his arm; his arm flexed
4.  to contract (a muscle) or (of a muscle) to contract
5.  (intr) to work according to flexitime
6.  to test or display (one's authority or strength)
[C16: from Latin flexus bent, winding, from flectere to bend, bow]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1520s, probably a back formation from flexibility. Related: Flexed; flexing.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

flex (flěks)
v. flexed, flex·ing, flex·es

  1. To bend.

  2. To contract a muscle.

  3. To move a joint so that the parts it connects approach each other.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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