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The Collaborative International Dictionary of English v.0.48 (gcide)

Thirtieth \Thir"ti*eth\, a. [From {Thirty}: cf. AS.
[thorn]r[imac]tig[=o][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.
[1913 Webster]

2. Constituting or being one of thirty equal parts into which
anything is divided.
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Thirtieth \Thir"ti*eth\, n.
The quotient of a unit divided by thirty; one of thirty equal
parts.
[1913 Webster]