Thir"ti*eth (?), a. [From Thirty: cf. AS. þritigo&edh;a.]


Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.


Constituting or being one of thirty equal parts into which anything is divided.


© Webster 1913.

Thir"ti*eth, n.

The quotient of a unit divided by thirty; one of thirty equal parts.


© Webster 1913.

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