thirtieth

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

3 meanings of thirtieth

1
adjective
Coming right after the twenty-ninth in order, holding position number thirty in a list or count.
Like counting houses along a street and reaching the 30th one, right after number 29.
She finished the race in thirtieth place.
Today marks their thirtieth wedding anniversary.
2
nouncountable
The person or thing that comes thirtieth in order, right after the twenty-ninth.
Out of all the racers, she was the thirtieth to finish.
He stood as the thirtieth person waiting in line for tickets.
3
nouncountable
One part of something that is split into thirty equal parts.
Like cutting a cake into 30 equal slices and taking just one slice.
Each investor got a thirtieth of the profit.
A thirtieth of the money was spent on repairs.

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It comes from Old English "þrītigoþa," made from "thirty" plus the ending "-eth."