(music) An interval of three whole tones. / A picture printed in three shades.

(immunology) Any of a class of non-peptidic antigens that are organic pyrophosphates

(Gaelic football, hurling) A forward who plays on either sides of the centre forwards.

The method by which a device performs its function. / The method or practice by which actions are done. / The act or process of operating; agency; the exertion of power, physical, mechanical, or mo...