Fan1  —n. 1 apparatus, usu. With rotating blades, for ventilation etc. 2 folding semicircular device waved to cool oneself. 3 thing spread out like a fan (fan tracery). —v. (-nn-) 1 blow air on, with or as with a fan. 2 (of a breeze) blow gently on. 3 (usu. Foll. By out) spread out like a fan. [latin vannus winnowing-basket]