eighteenth
  (a.)第十八的,第十八,第十八日
  Eight·eenth a.
  1. Next in order after the seventeenth.
  2. Consisting of one of eighteen equal parts or divisions of a thing.
  Eight·eenth, n.
  1. The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
  2. The eighth after the tenth.
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  eighteenth
       adj : coming next after the seventeenth in position [syn: 18th]
       n : position 18 in a countable series of things