Composing; constituent; entering into the composition of.n. A constituent part: as, quartz, feldspar, and mica are the components of granite.n. In mech., one of the parts of a strain, velocity, acceleration, force, etc., out of which the whole may be compounded by the principle of the parallelogram of forces, etc.—that is, by geometrical addition. See composition of forces (under composition), parallelogram of forces (under force), and resolution.n. A part of a whole which is so combined with other parts as to modify its distinctive character; especially, in logic, an internal part or part of comprehension; a notion contained in a complex notion.