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 …

on/at the threshold : at the beginning of something or very close to something (such as a new condition, an important discovery, etc.) — usually + of young people on the threshold of adulthood

A threshold is an amount, level, or limit on a scale. When the threshold is reached, something else happens or changes.

Also called limen. the point at which a stimulus is of sufficient intensity to begin to produce an effect: the threshold of consciousness; a low threshold of pain.

Mar 12, 2026 · Noun threshold (plural thresholds) The lowermost part of a doorway that one crosses to enter; a sill. Synonyms: doorsill, doorstep (by extension) An entrance; the door or gate of a house.

any point of beginning: He was on the threshold of a new career. Physiology, Psychology the point at which something begins to take effect: Her dream was hovering on the threshold of consciousness.

THRESHOLD definition: the sill of a doorway. See examples of threshold used in a sentence.