Having three corners; triangular. / (botany) Having three prominent longitudinal angles.

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

(of cloth) shabby, frayed and worn to an extent that warp threads show / damaged or shabby / (of a person) wearing clothes of threadbare material / banal or clichéd; trite or hackneyed

three times as great / triple

by a factor of three

(mathematics) An algebraic variety of dimension 3.

(gambling) A gambling game played with three coins.

a screw or worm gear having four equal threads and thus capable of being started in four places

(sports) A three-phase equestrian sport consisting of dressage, cross country, and show jumping.

(US, electricity) A type of light switch that can be arranged in pairs to control lights from two locations, as at either end of a stairway or long hallway; a double-throw switch. (Britain): two-way switch.