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Discrete in science is the opposite of continuous: something that is separate; distinct; individual. Discrete may refer to:
- Discrete particle or quantum in physics, for example in quantum theory
- Discrete device, an electronic component with just one circuit element, either passive or active, other than an integrated circuit
- Discrete group, a group with the discrete topology
- Discrete category, category whose only arrows are identity arrows
- Discrete mathematics, the study of structures without continuity
- Discrete optimization, a branch of optimization in applied mathematics and computer science
- Discrete probability distribution, a random variable that can be counted
- Discrete signal, a time series consisting of a sequence of quantities
- Discrete space, a simple example of a topological space
- Discrete spline interpolation, the discrete analog of ordinary spline interpolation
- Discrete time, non-continuous time, which results in discrete-time samples
- Discrete pitch, a pitch with a steady frequency, rather than an indiscrete gliding, glissando or portamento, pitch