DICT.TW Dictionary Taiwan

 thirtieth
 第三十,三十分之一

 Thir·ti·eth a.
 1. Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.
 2. Constituting or being one of thirty equal parts into which anything is divided.

 Thir·ti·eth, n. The quotient of a unit divided by thirty; one of thirty equal parts.
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 thirtieth
      adj : coming next after the twenty-ninth in position [syn: 30th]
      n : position 30 in a countable series of things