1. The quotient of a unit divided by three; one of three equal parts into which anything is divided.

2. The sixtieth part of a second of time.

3. (Mus.)

Defn: The third tone of the scale; the mediant.

4. pl. (Law)

Defn: The third part of the estate of a deseased husband, which, by
some local laws, the widow is entitled to enjoy during her life.
Major third (Mus.), an interval of two tones.
— Minor third (Mus.), an interval of a tone and a half.

THIRD-BOROUGH
Third"-bor`ough, n. (O. Eng. Law)

Defn: An under constable. Shak. Johnson.

THIRDINGS
Third"ings, n. pl. (Eng. Law)

Defn: The third part of the corn or grain growing on the ground at the tenant's death, due to the lord for a heriot, as within the manor of Turfat in Herefordshire.