Meaning & use
thirtieth
The ordinal number matching thirty in a sequence, coming after the twenty-ninth.
See it in a sentence
They celebrated her thirtieth birthday with a small dinner among close friends.
This is the thirtieth time he has told that same fishing story.
A note on using this word
Thirtieth is written as 30th in numerals and functions as both an adjective and, less commonly, a noun.
Words with a similar meaning
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