 Threshold (TV series): Encyclopedia - Threshold
In general, a threshold is a fixed location or value where an abrupt change is observed. It may also have the following meanings:
In architecture, a threshold is a strip of wood, metal or stone located on the floor in a doorway following the line of division between the two spaces linked by the doorway.
In aviation, a threshold is the end of a runway over which an airplane first passes when landing.
In Biology, an action potential is initiated if the membrane potential ...
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