The meaning of Thirtieth and additional information.

Thirtieth(a.) Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.

Thirtieth(a.) Constituting or being one of thirty equal parts into which anything is divided.

Thirtieth(n.) The quotient of a unit divided by thirty; one of thirty equal parts.