The word for today is…
threshold (noun):
1: the plank, stone, or piece of timber that lies under a door : sill
2a: gate, door
b(1): end, boundary – specifically, the end of a runway
(2): the place or point of entering or beginning : outset
3a: the point at which a physiological or psychological effect begins to be produced
b: a level, point, or value above which something is true or will take place and below which it is not or will not
Source : Merriam -Webster
Etymology : Whenever you leave your home, walk from one room to another, or enter a building, you are crossing a threshold—that is, the horizontal floor piece that you cross over whenever you move through a doorway. But the earliest uses of threshold refer to a different type of boundary: an Old English translation of Boethius’s De consolatione philosophiae uses the word in a sentence about how the sea was made so that it didn’t overstep the “threshold,” or boundary, of the earth. In this translation, which was written around 888, threshold appears as peorscwold (that first letter is called thorn and it was used in Old English and Middle English to indicate the sounds produced by th in thin and this). The origins of this Old English word are not known, though it is believed to be related to the Old English word threscan, from which we get the words thresh, meaning “to separate seed from (a harvested plant) using a machine or tool” and thrash, meaning, among other things, “to beat soundly with or as if with a stick or whip.” But there’s nothing in the historical record that directly ties threshing to the threshold.
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