A group of three people or things. / A group of three musicians. / (music) A piece of music written for three musicians. / (music) A passage in the middle of a minuet, frequently in a different key.

plural of trio

a type of musical composition with two melodic parts and basso continuo

plural of trio sonata

(music) A rock-and-roll band lineup consisting of electric guitar, bass guitar, and drum kit, omitting the rhythm guitar and keyboard instrument associated with larger lineups.

plural of power trio

A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode, which makes amplification possible.

(chemistry) any oxide containing three oxygen atoms in each molecule / (chemistry) any organic compound of general formula R-OOO-R', derived from trioxidane

(games) A triangular tile, used in triominoes, a variant of the game of dominoes.

(geometry) Alternative form of tromino