The definition of discreet is someone or something that is careful about their behavior or keeps secrets.(adjective)
An example of discreet is the policy of a hair salon that won’t tell who their famous clients are.
See discreet in Webster's New World College Dictionary
Origin: ME & OFr discret < L discretus, pp. of discernere: see discern
See discreet in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old French discret
Origin: , from Medieval Latin discrētus
Origin: , from Latin
Origin: , past participle of discernere, to separate, discern; see discern.
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