a temporary fashion, notion, manner of conduct, etc., esp. one followed enthusiastically by a group.

noun

standard , tradition

noun

affectation , amusement , caprice , chic , conceit , cry , custom , dernier cri , eccentricity , fancy , fantasy , fashion , fool notion , frivolity , furor , hobby , humor , in , innovation , in thing , kick , kink , latest word , mania , mode , newest wrinkle , new look , passing fancy , passion , quirk , rage , sport , style , thing , trend , vagary , vogue , whim , whimsy , wrinkle , craze , foible , megrim , monomania