The word characteristic has several meanings:

In mathematics, see

• characteristic (algebra)
• characteristic function
• characteristic subgroup
• Euler characteristic
• method of characteristics

In genetics, see characteristic (genetics).

Characteristic is also sometimes used as a piece of jargon in discussions of universals in metaphysics, often in the phrase 'distinguishing characteristics'.

An I-V or current-voltage characteristic is the current in a circuit as a function of the applied voltage. It is used, for example, to describe diodes and Langmuir probes.