Definition
late Middle English: from Old French ethimologie, via Latin from Greek etumologia, from etumologos ‘student of etymology’, from etumon, neuter singular of etumos ‘true’.
wiktionary
From Middle English diffinicioun, from Middle French definition, from Latin dēfīnītiō, from dēfīniō. Equivalent to define + -tion.
etymonline
definition (n.)
late 14c., diffinicioun, definicion, "decision, setting of boundaries, determination and stating of the limits and distinctive nature of a thing," also "limitations," also "a statement of the meaning of a word or phrase," from Old French definicion, from Latin definitionem (nominative definitio) "a bounding, a boundary; a limiting, prescribing; a definition, explanation," the last sense most often in Cicero, noun of action from past-participle stem of definire "to limit, determine, explain," from de "completely" (see de-) + finire "to bound, limit," from finis "boundary, end" (see finish (v.)). In logic, meaning "act of stating what something means" is from 1640s. Meaning "degree of distinctness of the details in a picture" is from 1889.
