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.
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