The Collaborative International Dictionary of English v.0.48:
gaffe \gaffe\ (g[a^]f), n. A socially awkward or tactless act. Syn: faux-pas, solecism, slip, gaucherie. [WordNet 1.5]WordNet (r) 3.0 (2006):
gaffe n 1: a socially awkward or tactless act [syn: faux pas, gaffe, solecism, slip, gaucherie]