Fourth1, a.
(fōrth), a. [A-S feōrdha, from feōwer, four.] 1. Next following the third and preceding the fifth; coming after three predecessors. 2. Forming one of four parts into which any thing is divided.
2 entries under this word
Fourth
Fōurth2, n.
n. 1. One of four equal parts into which one whole is divided; the quotient of a unit divided by four.
Sense 2. (Mus.) The interval of two tones and a semitone, embracing four diatonic degrees of the scale.