The magnitude or intensity that must be exceeded for a certain reaction, phenomenon, result, or condition to occur or be manifested.

Related to senses and perception: Absolute threshold Sensory threshold, a concept in psychology Threshold of pain, a concept in pain science Absolute threshold of hearing Masking threshold Odor detection threshold Related to visual system: Flicker fusion threshold Dark adaptation threshold Action potential, a concept in neurophysiology Low-threshold spikes Renal threshold, the level at which a given substance in the blood is taken up by the kidneys and enters the urine Threshold expression Threshold potential Threshold Limit Value Aerobic threshold Anaerobic threshold Linear no-threshold model Seizure threshold Threshold model in toxicology Threshold (reference value)