1. Adjective
Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.
2. Adjective
Constituting or being one of thirty equal parts into which anything is divided.
3. Noun
The quotient of a unit divided by thirty; one of thirty equal parts.
4. Noun
position 30 in a countable series of things
Vocabulary classified under Sociology
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