Etymology
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observant (adj.)

c. 1600, "attentive in perceiving or taking notice, characterized by good powers of observation," also "attentive in observing what is prescribed or required" (a law, custom, etc.), from observe + -ant, or else from French observant, past participle of observer (see observance). In reference to Judaism, "strict in acting in accordance with precepts," from 1902. As a noun from late 15c. Related: Observantly; observantness.

updated on July 26, 2019

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Definitions of observant from WordNet

observant (adj.)
paying close attention especially to details;
observant (adj.)
quick to notice; showing quick and keen perception;
Synonyms: observing
observant (adj.)
(of individuals) adhering strictly to laws and rules and customs;
observant of the speed limit
Synonyms: law-abiding
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.