thirtieth

SayTHUR-tee-uhthUS/ˈθɝti.əθ/UK/ˈθɜːti.əθ/

3 meanings of thirtieth

1
adjective
Holding the position that comes after the twenty-ninth in a counted sequence, matching the number thirty.
The library celebrated its thirtieth year of serving the town.
He scored his thirtieth goal of the season on Friday night.
2
nouncountable
The person or thing occupying position number thirty in an ordered set or ranking.
Among the candidates interviewed, she ranked thirtieth overall.
The committee welcomed him as the thirtieth member to join since the club's founding.
3
nouncountable
Any one of thirty equal parts into which a whole is divided.
Each of the thirty heirs inherited a thirtieth of the estate.
The recipe calls for a thirtieth of the spice mixture per serving.

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From earlier "thirteth," from Middle English "thrittithe," from Old English "þrītigoþa"; it is equivalent to "thirty" plus the suffix "-eth."