modulus

noun (plural moduli /-ˌlī, -ˌlē/)

• 1another term for absolute value.
• the positive square root of the sum of the squares of the real and imaginary parts of a complex number.

• 2a constant factor or ratio.
• a constant indicating the relation between a physical effect and the force producing it.

• 3a number used as a divisor for considering numbers in sets, numbers being considered congruent when giving the same remainder when divided by a particular modulus.