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Definition of Time constant
1. Noun. (electronics) the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude.
Category relationships: Electronics
Generic synonyms: Interval, Time Interval
Specialized synonyms: Relaxation Time
Generic synonyms: Interval, Time Interval
Specialized synonyms: Relaxation Time
2. Noun. The ratio of the inductance of a circuit in henries to its resistance in ohms.
Generic synonyms: Ratio
Medical Definition of Time constant
1. That part of a circuit that determines the time interval over which the rate of electrical events will be averaged; in pulmonary physiology, the factors determining rate of flow in the airways. (05 Mar 2000)