Originally posted by another user
thresh·old
ˈTHreSHˌ(h)ōld/Submit
noun
1.
a strip of wood, metal, or stone forming the bottom of a doorway and crossed in entering a house or room.
synonyms: doorstep, doorway, entrance, entry, door, gate, gateway, portal, doorsill
"the threshold of the church"
a point of entry or beginning.
"she was on the threshold of a dazzling career"
synonyms: start, beginning, commencement, brink, verge, cusp, dawn, inception, day one, opening, debut; informalkickoff
"the threshold of a new era"
the beginning of an airport runway on which an aircraft is attempting to land.
2.
the magnitude or intensity that must be exceeded for a certain reaction, phenomenon, result, or condition to occur or be manifested.
"nothing happens until the signal passes the threshold"