GIGAFLOP Meaning of GIGAFLOP in English [ 'gɪgəflɒp , 'dʒ- ]■ noun Computing a unit of computing speed equal to one thousand million floating-point operations per second.Origin1970s: from giga- + -flop . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004