absolute valueEnglishOxford New American Dictionaryabsolute value /ˈˌabsəˈˌl(y)o͞ot ˈvalyo͞o, ˈˌæbsəˈˌl(j)ut ˈvælju/ ▸ noun 1 Mathematics the magnitude of a real number without regard to its sign. Also called modulus. The absolute value of a complex number a + ib is the positive square root of a 2+ b 2. 2 technical the actual magnitude of a numerical value or measurement, irrespective of its relation to other values.