1. Next in order after the third; the ordinal of four.
2. Forming one of four equal parts into which anything may be divided.
FOURTH
Fourth, n.
1. One of four equal parts into which one whole may be divided; the quotient of a unit divided by four; one coming next in order after the third.
2. (Mus.)
Defn: The interval of two tones and a semitone, embracing four diatonic degrees of the scale; the subdominant of any key. The Fourth, specifically, un the United States, the fourth day of July, the anniversary of the declaration of American independence; as, to celebrate the Fourth.
FOURTHLY
Fourth"ly, adv.
Defn: In the fourth place.
FOUR-WAY
Four"-way`, a.
Defn: Allowing passage in either of four directions; as, a four-way cock, or valve. Francis. Four-way cock, a cock connected with four pipes or ports, and having two or more passages in the plug, by which the adjacent pipes or ports may be made to communicate; formerly used as a valve in the steam engine, and now for various other purposes. In the illustration, a leads to the upper end of a steam engine cylinder, and b to the lower end; c is the steam pipe, and d the exhaust pipe.