Webster's English Dictionary

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threshold

thresh.old \'thresh-.(h)o-ld\ n [ME thresshold, fr. OE threscwald; akin to 
   ON threskjo:ldr t]hreshold, OE threscan to thresh 1: the plank, stone, or 
   piece of timber that lies under a door : SILL)M 2a: GATE, DOOR  2b1: END, 
   BOUNDARY; specif : the end of a runway  2b2: the place or point of entering 
   or beginning : OUTSET  3: the point at which a physiological or 
   psychological effect begins to be  produced {~ of consciousness a high 
   renal clearance ~}