Definition of: third

(thûrd) adjective
1. Next in order after second: the ordinal of three.
2. Being one of three equal parts.
—noun
1. One of three equal parts of anything.
2. The person or thing coming after the second, as in a series.
3. plural Law The third part of a husband's personal estate, allotted to the widow in case of his dying intestate and leaving an heir; also, loosely, a dower.
4. A unit of time or of an arc, equal to one sixtieth of a second.
5. Music a The interval between any note and the next note but one above it on a diatonic scale, known as a major third when such interval is two whole steps or degrees of the staff, and as a minor third when it is a step and a half. b A note separated by this interval from any other, considered in relation to that other; specifically, the third above the keynote. c Two notes at this interval written or sounded together, or the consonance so produced.
6. In baseball, the third base.
—adverb In the third order, rank, or place: also, in formal discourse, third′ly. [OE thridda <thrī three]