- noun the limit below which a significant adverse effect is not expected
- noun a point at which something is strong enough to be sensed by an instrument or by a sensory nerve
- The point, level, or value of a quantity which must be exceeded to have a given effect, result, or response, such as detection, activation, or operation. For instance, the threshold of hearing, the minimum voltage or current necessary to activate a circuit, or the frequency beyond which a loudspeaker does not reproduce sound. Also called limen.
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