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Definition of fad : A hobby ; freak; whim.

Synonyms:

cry, prevailing taste, frivolity, chic, vogue, passion, freak, whim, amusement, style, affectation, crotchet, all the rage, dernier cri, the in thing, enthusiasm, religious cult, fashion, the last word, hobby, go, frenzy, quirk, ton, passing fashion, flavor, rage, kink, whimsy, delirium, innovation, the latest thing, cultus, furor, hysteria, last word, madness, in joke, sensation, humor, popular innovation, fancy, latest, passing fancy, flavor of the month/week, thing, hot ticket, flash in the pan, caprice, vagary, mode, eccentricity, usual, the new look, mania, custom, the latest word, cult, a flash in the pan, novelty, buzz, fury, maggot, the thing, trend, furore, craze

Usage examples:

• I did have that fad, didn't I? - "A Man and a Woman", Stanley Waterloo.
• Give her a week of handlin' and trim her up, and it'll be Jack for mother at a stiff price; he's so bent on his fad, he'll take a chance on her age. - "The Red-Blooded Heroes of the Frontier", Edgar Beecher Bronson.
• She has some fad about spoiling the magnetic current of Apollo or something. - "The Altar Steps", Compton MacKenzie.