Définitions
1.NounThe lowermost part of a doorway that one crosses to enter; a sill.
2.NounAn entrance; the door or gate of a house.
3.NounAny end or boundary.
4.NounThe outset of something; the point of entry, or the beginning of an action."on the threshold of maturity"
5.NounThe start of the landing area of a runway.
6.NounThe quantitative point at which an action is triggered, especially a lower limit.
7.NounThe wage or salary at which income tax becomes due.
8.NounThe point where one is mentally or physically vulnerable in response to a provocation or to other nuisances.