threshold
Pronunciation:
/ˈθɹeʃ(h)əʊld//ˈθɹɛʃ(h)oʊld/noun
Definitions
The bottom-most part of a doorway that one crosses to enter; a sill.
(by extension) An entrance; the door or gate of a house.
(by extension) Any end or boundary.
The outset of something; the point of entry, or the beginning of an action.