Answer:
a chord in which the tones are a fourth apart, instead of a third.
Explanation:
In Music, a chord can be defined as any harmonic set of pitches or group of musical notes (pitch) that are sounded simultaneously or together.
A chord combines three or more musical notes harmoniously and as such can only be played on musical instruments such as a guitar, piano, ukulele, xylophone, keyboard, harmonica, harp etc, but it cannot be played on a single note instrument like trumpet.
<em>A fourth chord is a chord in which the tones are a fourth apart, instead of a third (triad). They are used in playing jazz. </em>