Third n.
 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. The third tone of the scale; the mediant.
 4. pl. Law The third part of the estate of a deceased 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.
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