twentieth
  第二十個二十分之一
  Twen·ti·eth a.
  1. Next in order after the nineteenth; tenth after the tenth; coming after nineteen others; -- the ordinal of twenty.
  2. Constituting, or being, one of twenty equal parts into which anything is divided.
  Twen·ti·eth, n.
  1. The next in order after the nineteenth; one coming after nineteen others.
  2. The quotient of a unit divided by twenty; one of twenty equal parts of one whole.
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  twentieth
       adj : coming next after the nineteenth in position [syn: 20th]
       n : position 20 in a countable series of things