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1. Oxford American Dictionary

   threshold

   • IPA[ˈTHreSHˌ(h)ōld]

   美式

   • n.
     a strip of wood, metal, or stone forming the bottom of a doorway and crossed in entering a house or room；a point of entry or beginning

   • noun: threshold, plural noun: thresholds

2. • 釋義

   n.

   名詞

   • 1. a strip of wood, metal, or stone forming the bottom of a doorway and crossed in entering a house or room he stood on the threshold of Sheila's bedroom 同義詞 doorstep, sill, doorsill, doorway, entrance, ... 更多entry, way in, door, gate, gateway, portal, approach
   • ▪ a point of entry or beginning she was on the threshold of a dazzling career 同義詞 start, starting point, beginning, brink, verge, ... 更多edge, dawn, birth, origin, inception, conception, opening, launch, inauguration, institution, initiation, debut, creation, day one, informalkickoff, formalcommencement反義詞 end
   • ▪ the beginning of an airport runway on which an aircraft is attempting to land.
   • 2. the magnitude or intensity that must be exceeded for a certain reaction, phenomenon, result, or condition to occur or be manifested nothing happens until the signal passes the threshold a threshold level
   • ▪ the maximum level of radiation or a concentration of a substance considered to be acceptable or safe their water would meet the safety threshold of 50 milligrams of nitrates per liter 同義詞 lower limit, starting point, minimum, margin, limen
   • ▪ a limit below which a stimulus causes no reaction everyone has a different pain threshold
   • ▪ a level, rate, or amount at which something comes into effect the tax threshold has risen to $10,492 of adjusted gross income