Definition of "elastic"

elastic

/iˈlæstɪk/

adjective
comparative more elastic, superlative most elastic
1. Capable of stretching; particularly, capable of stretching so as to return to an original shape or size when force is released.
  Quotations
  In trumpets for assisting the hearing, all reverbation of the trumpet must be avoided. It must be made thick, of the least elastic materials, and covered with cloth externally. For all reverbation lasts for a short time, and produces new sounds which mix with those which are coming in.
  1820, Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and Miscellaneous Literature‎, 6th edition, volume 20, Edinburgh: Archibald Constable and Company, page 501
2. Made of elastic.
3. Of clothing, elasticated.
4. (economics) Sensitive to changes in price.
5. springy; bouncy; vivacious
  Quotations
  He could see that she was tastefully, though not richly, dressed, and that she walked with an elastic step that revealed a light heart and the vigor of perfect health. Her face, of course, he could not analyze, since he had caught only the one brief but convincing glimpse of it.
  1900, Charles W. Chesnutt, chapter I, in The House Behind the Cedars
6. Pervasive, all-encompassing.
  Quotations
  It was now about six o'clock, and that first freshness was on the air, which is to the day what youth is to life,—so light, so elastic, so sweet, and so brief:...
  1834, L[etitia] E[lizabeth] L[andon], chapter X, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), page 74
7. Able to return quickly to a former state or condition, after being depressed or overtaxed; having power to recover easily from shocks and trials.
noun
countable and uncountable, plural elastics
1. (uncountable) An elastic material used in clothing, particularly in waistbands and cuffs.
2. (countable) An elastic band.