Etymology
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define (v.)

late 14c., deffinen, diffinen, "to specify; to fix or establish authoritatively;" of words, phrases, etc., "state the signification of, explain what is meant by, describe in detail," from Old French defenir, definir "to finish, conclude, come to an end; bring to an end; define, determine with precision," and directly from Medieval Latin diffinire, definire, from Latin definire "to limit, determine, explain," from de "completely" (see de-) + finire "to bound, limit," from finis "boundary, end" (see finish (v.)). From c. 1400 as "determine, declare, or mark the limit of." Related: Defined; defining.

Origin and meaning of define
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Definitions of define

define (v.)
determine the essential quality of;
Synonyms: specify / delineate / delimit / delimitate
define (v.)
give a definition for the meaning of a word;
define (v.)
determine the nature of;
What defines a good wine?
define (v.)
show the form or outline of;
The tree was clearly defined by the light
The camera could define the smallest object
Synonyms: delineate
define (v.)
decide upon or fix definitely;
Synonyms: specify / set / determine / fix / limit
From wordnet.princeton.edu