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flex1

[fleks] /flɛks/
verb (used with object)
1.
to bend, as a part of the body:
He flexed his arms to show off his muscles.
2.
to tighten (a muscle) by contraction.
verb (used without object)
3.
to bend.
noun
4.
the act of flexing.
5.
British.
  1. any flexible, insulated electric cord; an electric cord or extension cord.
  2. Slang. an elastic band, as a garter.
6.
Mathematics. an inflection point.
Origin of flex1
1515-1525
1515-25; (adj.) < Latin flexus, past participle of flectere to bend, turn; (noun) < Latin flexus act of bending, equivalent to flect(ere) + -tus suffix of v. action

flex2

[fleks] /flɛks/
adjective
1.
Informal. flexible:
a flex program of workers' benefits.
Origin
shortening of flexible

flex-

1.
a combining form representing flexible in compound words:
flextime.
Also, flexi-.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for flex
Contemporary Examples
Historical Examples
  • Now you understand why the flex of the telephone is so long.

    Hard Pressed Fred M. White
  • He picked it up and flexed it a bit, as a man might flex a rapier to test its material.

    Islands of Space John W Campbell
  • Note the powerful muscles within which flex and extend the abdomen.

  • When he was lying, he could flex the thigh and the legs slowly and feebly.

    Arteriosclerosis and Hypertension: Louis Marshall Warfield
  • If Steve's face was unpleasant to look upon, the nonchalant, tiger-like poise and flex of his body was not.

    Prairie Folks Hamlin Garland
British Dictionary definitions for flex

flex

/flɛks/
noun
1.
(Brit) a flexible insulated electric cable, used esp to connect appliances to mains US and Canadian name cord
2.
(informal) flexibility or pliability
verb
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.
(intransitive) to work according to flexitime
6.
to test or display (one's authority or strength)
Word Origin
C16: from Latin flexus bent, winding, from flectere to bend, bow
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
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Word Origin and History for flex
v.

1520s, probably a back-formation from flexible. Related: Flexed; flexing.

Online Etymology Dictionary, © 2010 Douglas Harper
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flex in Medicine

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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flex in Technology

language
1. Faster LEX.
2. A real-time language for dynamic environments.
["FLEX: Towards Flexible Real-Time Programs", K. Lin et al, Computer Langs 16(1):65-79, Jan 1991].
3. An early object-oriented language developed for the FLEX machine by Alan Kay in about 1967. The FLEX language was a simplification of Simula and a predecessor of Smalltalk.
(1995-03-29)

software, hardware
A system developed by Ian Currie (Iain?) at the (then) Royal Signals and Radar Establishment at Malvern in the late 1970s. The hardware was custom and microprogrammable, with an operating system, (modular) compiler, editor, garbage collector and filing system all written in Algol-68. Flex was also re-implemented on the Perq(?).
[I. F. Currie and others, "Flex Firmware", Technical Report, RSRE, Number 81009, 1981].
[I. F. Currie, "In Praise of Procedures", RSRE, 1982].
(1997-11-17)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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14
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