Discrete - Definition and Overview

The word discrete comes from the Latin word discretus which means separate. It is used with different meanings in different contexts:

• In perception, a discrete entity is something that can be perceived individually and not as connected to, or part of something else.
• In mathematics, a discrete set is a countable set. The mathematical study of discrete sets is the area of inquiry for discrete mathematics, but is also important for combinatorics, probability theory and statistical theory.
• In mathematics, a discrete space is a topological space in which all sets are open.
• In electrical engineering, discrete means having separate electronic components, such as individual resistors and inductors. This is the opposite of integrated circuitry.
• In audio engineering, discrete means having separate and independent channels of audio, as opposed to matrixed stereo or quadrophonic, or other multi-channel sound.
• In reference to signals, dynamic systems, or control theory, discrete often means the same thing as digital.
• In music, a discrete pitch is one with a steady frequency, rather than an indiscrete gliding, glissando or portamento, pitch.

Discrete is not the same thing as discreet.