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Definition of thirtieth:

  1. Constituting or being one of thirty equal parts into which anything is divided.
  2. Next in order after the twenty- ninth; the tenth after the twentieth; - the ordinal of thirty; as, the thirtieth day of the month.
  3. The quotient of a unit divided by thirty; one of thirty equal parts.

Synonyms:

30th, ordinal.

Usage examples: