dada n 1: an informal term for a father; probably derived from baby talk [syn: {dad}, {dada}, {daddy}, {pa}, {papa}, {pappa}, {pop}] 2: a nihilistic art movement (especially in painting) that flourished in Europe early in the 20th century; based on irrationality and negation of the accepted laws of beauty [syn: {dada}, {dadaism}]