Fourth(a.)
- Next in order after the third; the ordinal of four.
Fourth(a.)
- Forming one of four equal parts into which anything may be divided.
Fourth(n.)
- 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.
Fourth(n.)
- The interval of two tones and a semitone, embracing four diatonic degrees of the scale; the subdominant of any key.