Buildingthe entrance to a house or building:They waved good-bye from the threshold.
any point of beginning:He was on the threshold of a new career.
Physiology, Psychologythe point at which something begins to take effect:Her dream was hovering on the threshold of consciousness. He has a low threshold of pain.
any place or point of entering or beginning:the threshold of a new career.
Physiology, PsychologyAlso called limen.[Psychol., Physiol.] 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.
bef. 900; Middle English threschold, Old English threscold, threscwald; cognate with Old Norse threskǫldr, dialect, dialectal Swedish träskvald; akin to thresh in old sense "trample, tread''; -old, -wald unexplained