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Definition of Thirtieth
1. Noun. Position 30 in a countable series of things.
Generic synonyms: Rank
2. Adjective. Coming next after the twenty-ninth in position.
Definition of Thirtieth
1. a. Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.
2. n. The quotient of a unit divided by thirty; one of thirty equal parts.
Definition of Thirtieth
1. [n -S]