(astronomy) The waxing lunar phase, from new moon to half way between new moon and full moon.

the waning lunar phase halfway between full moon and new moon.

of three fourths of the usual dimension / (of a portrait) with the subject turned slightly away from a frontal view

(rugby) A player positioned between the half-backs and the full-backs (properly a three-quarter back) / (only in singular) A fraction with three of four equal parts (=75 %)

Three of four equal parts (3/4, ¾, 0.75).

A belt connecting pulleys whose axles are at right angles; a quarter turn belt.

(electricity) Differing in phase by a quarter of a cycle; two-phase.

(nautical, obsolete) Hammock nettings along a ship's quarter rails.

(obsolete) A gentleman usher on duty in the English court for three months of each year.

a blanket used under the saddle of a horse