(1):

(a.) Forming one of four equal parts into which anything may be divided.

(2):

(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.

(3):

(n.) The interval of two tones and a semitone, embracing four diatonic degrees of the scale; the subdominant of any key.

(4):

(a.) Next in order after the third; the ordinal of four.