(i) In no-fault Insurance, the minimum extent of injury which a claimant must suffer before being entitled to being a tort suit against a wrongdoer causing the injury. If the injury does not exceed the threshold, the injured claimant can receive only no-fault (or other first-party Insurance) benefits. (ii) In physiology, the minimum stimulus to which the body responds or is consciously aware. Physiological thresholds can be described as either absolute or relative. Absolute Threshold : Minimum amount of stimulus energy to which a sense can respond. Relative Threshold : Minimum difference in stimulus that a sense can recognize.Threshold Limit Value (T.L.V.) : Maximum airborne concentration of a harmful substance to which it is believed nearly all workers may be repeatedly exposed, day after day, without adverse effect. Air at such a value may be breathed continually for eight hours per day without harm. Because of wide variations in individual susceptibility, exposure of an occasional individual to or even below, the TLV may not prevent discomfort, aggravation of a pre-existing condition, or occupational illness.