Thir"ti*eth (?), a. [From Thirty: cf. AS. þrītigōða.] 1. Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.

2. Constituting or being one of thirty equal parts into which anything is divided.

Thir"ti*eth, n. The quotient of a unit divided by thirty; one of thirty equal parts.

Thir"ti*eth (?), a. [From Thirty: cf. AS. þrītigōða.] 1. Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.

2. Constituting or being one of thirty equal parts into which anything is divided.

Thir"ti*eth, n. The quotient of a unit divided by thirty; one of thirty equal parts.

• The ordinal form of the number thirty.
  
• The person or thing in the thirtieth position.
  
• One of thirty equal parts of a whole.