No longer current or in fashion; out-of-date. 2. Past the prime; faded or aged. [ French, past participle of passer, to pass, from Old French; see pass.] American. Define passé: no longer fashionable or popular — passé in a sentence. Passé definition: If someone describes something as passé , they think that it is no longer fashionable or | Meaning, pronunciation, translations and examples.