1. the magnitude of a quantity, irrespective of sign; the distance of a quantity from zero. The absolute value of a number is symbolized by two vertical lines, as ||3|| or ||-3|| is 3.
2. the square root of the sum of the squares of the real and imaginary parts of a given complex number, as ||a + bi|| is equal to . Also called modulus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.