SQUARE Meaning of SQUARE in English ( n. ) The product of a number or quantity multiplied by itself; thus, 64 is the square of 8, for 8 / 8 = 64; the square of a + b is a2 + 2ab + b2. Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012