1. (a.) Next after the second; coming after two others; -- the ordinal of three; as, the third hour in the day.

2. (a.) Constituting or being one of three equal parts into which anything is divided; as, the third part of a day.

3. (n.) The quotient of a unit divided by three; one of three equal parts into which anything is divided.

4. (n.) The sixtieth part of a second of time.

5. (n.) The third tone of the scale; the mediant.

6. (n.) The third part of the estate of a deceased husband, which, by some local laws, the widow is entitled to enjoy during her life.

consecutive intervals degree diapason diatessaron diatonic interval diatonic semitone divide in thirds enharmonic diesis enharmonic interval fifth fourth half step halftone interval irregular less semitone melodic interval note octave parallel octaves schlock schmatte second semitone seventh sixth step tertiary tierce tone trichotomize trifurcate unison interval whole step