Definition of "instinct"
instinct
noun
countable and uncountable, plural instincts
A natural or inherent impulse or behaviour.
Quotations
By a divine instinct, men's minds mistrust / Ensuing dangers.
c. 1593 (date written), William Shakespeare, “The Tragedy of Richard the Third: […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene iii]
In spite of these qualifications, the broad distinction between instinct and habit is undeniable. To take extreme cases, every animal at birth can take food by instinct, before it has had opportunity to learn; on the other hand, no one can ride a bicycle by instinct, though, after learning, the necessary movements become just as automatic as if they were instinctive.
1921, Bertrand Russell, The Analysis of Mind
adjective
comparative more instinct, superlative most instinct
(archaic) Imbued, charged (with something).
Quotations
Her eyes, whose colour I had not at first known, so dim were they with repressed tears, so shadowed with ceaseless dejection, now, lit by a ray of the sunshine that cheered her heart, revealed irids of bright hazel – irids large and full, screened with long lashes; and pupils instinct with fire.
1857, Charlotte Brontë, The Professor
This thing, which seemed instinct with a fearsome and unnatural malignancy, was of a somewhat bloated corpulence, and squatted evilly on a rectangular block or pedestal covered with undecipherable characters.
1928 February, H[oward] P[hillips] Lovecraft, “The Call of Cthulhu”, in Farnsworth Wright, editor, Weird Tales: A Magazine of the Bizarre and Unusual, volume 11, number 2, Indianapolis, Ind.: Popular Fiction Pub. Co., pages 159–178 and 287