Definition:Modulus


 * The absolute value $$\left|{x}\right|$$ of a real number $$x$$.


 * Modulus of Complex Number: the "length" of a complex number when drawn as a vector on the complex plane.


 * Modulus of Complex-Valued Function: The function $$\left|{f}\right|$$ obtained by taking the Modulus of all the values of the function $$f$$.


 * Modulus (Geometric Function Theory): The term modulus is used to denote certain conformal invariants of configurations or curve families.


 * Congruence (Number Theory): where $$x \equiv y \left({\bmod\, z}\right)$$, $$z$$ is the modulus.