noun the sixtieth part of a second of time.
2. third ·noun the third tone of the scale; the mediant.
3. third ·noun the quotient of a unit divided by three; one of three equal parts into which anything is divided.
4. third ·adj next after the second; coming after two others;
the ordinal of three; as, the third hour in the day.
5. third ·adj constituting or being one of three equal parts into which anything is divided; as, the third part of a day.
6. third ·noun the third part of the estate of a deceased husband, which, by some local laws, the widow is entitled to enjoy during her life.