capable of returning to its original length, shape, etc., after being stretched, deformed, compressed, or expanded: an elastic waistband; elastic fiber.
spontaneously expansive, as gases.
flexible; accommodating; adaptable; tolerant: elastic rules and regulations.
springing back or rebounding; springy: He walks with an elastic step.
readily recovering from depression or exhaustion; buoyant: an elastic temperament.
Economics. relatively responsive to change, as to a proportionate increase in demand as the result of a decrease in price. Compare inelastic ( def 2 ).
Physics. of, pertaining to, or noting a body having the property of elasticity.
webbing, or material in the form of a band, made elastic, as with strips of rubber.
something made from this material, as a garter.

1645–55; < Neo-Latin elasticus expanding spontaneously, equivalent to Greek elast(ós) (late variant of elatós ductile, beaten (of metal), derivative of elaúnein, elân beat out, forge) + -icus -ic

elastically, adverb
nonelastic, adjective
nonelastically, adverb
semielastic, adjective
semielastically, adverb
superelastic, adjective
superelastically, adverb
unelastic, adjective
unelastically, adverb

3. resilient, pliant.

3. rigid, inflexible, intolerant, unyielding. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
elastic (ɪˈlæstɪk)
1.  (of a body or material) capable of returning to its original shape after compression, expansion, stretching, or other deformation
2.  capable of adapting to change: an elastic schedule
3.  quick to recover from fatigue, dejection, etc; buoyant
4.  springy or resilient: an elastic walk
5.  (of gases) capable of expanding spontaneously
6.  physics (of collisions) involving no overall change in translational kinetic energy
7.  made of elastic
8.  tape, cord, or fabric containing interwoven strands of flexible rubber or similar substance allowing it to stretch and return to its original shape
9.  chiefly (US), (Canadian) something made of elastic, such as a rubber band or a garter
[C17: from New Latin elasticus impulsive, from Greek elastikos, from elaunein to beat, drive]

superelastic (ˌsuːpərɪˈlæstɪk)
physics (of collisions) involving an overall increase in translational kinetic energy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1653, coined in Fr. (1651) as a scientific term to describe gases, from Gk. elastos "ductile, flexible," related to elaunein "to strike, beat out," of uncertain origin. Applied to solids from 1674. The noun, "cord or string woven with rubber," is 1847, Amer.Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

elastic e·las·tic (ĭ-lās'tĭk)
Having the property of returning to the original shape after being distorted.

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