Princeton's WordNet

1. threshold(noun)

   the starting point for a new state or experience

   "on the threshold of manhood"

2. threshold, limen(noun)

   the smallest detectable sensation

3. doorway, door, room access, threshold(noun)

   the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close

   "he stuck his head in the doorway"

4. doorsill, doorstep, threshold(noun)

   the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway

5. brink, threshold, verge(noun)

   a region marking a boundary

Kernerman English Learner's Dictionary

1. threshold(noun)ˈθrɛʃ oʊld, ˈθrɛʃ hoʊld

   the level at which a rule starts to take effect or a limit is reached

   the income threshold for paying the higher tax; a woman with a high pain threshold

2. thresholdˈθrɛʃ oʊld, ˈθrɛʃ hoʊld

   at a point where sth is about to begin

   on the threshold of a major scientific discovery

Wiktionary

1. threshold(Noun)

   The bottom-most part of a doorway that one crosses to enter; a sill.

2. threshold(Noun)

   An entrance

3. threshold(Noun)

   The start of the landing area of a runway

4. threshold(Noun)

   The quantitative point at which an action is triggered, especially a lower limit

5. threshold(Noun)

   The wage or salary at which income tax becomes due

6. threshold(Noun)

   The outset of an action or project

7. threshold(Noun)

   The point where one mentally or physically is vulnerable in response to provocation or to particular things in general. As in emotions, stress, or pain.

8. threshold(Noun)

   The point of beginning or entry

   From all the pressure my partner has been through lately, his emotion threshold has suddenly gotten pretty low these days. I can tell because he easily loses it when he is around people or hears about anything to do with his concerns.

Origin: From þrescold, from þrescan

Webster Dictionary

1. Threshold(noun)

   the plank, stone, or piece of timber, which lies under a door, especially of a dwelling house, church, temple, or the like; the doorsill; hence, entrance; gate; door

2. Threshold(noun)

   fig.: The place or point of entering or beginning, entrance; outset; as, the threshold of life

Dictionary of Military and Associated Terms

1. threshold

   The beginning of that portion of the runway usable for landing.

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