n. The structure of a machine, engine, or other contrivance for controlling or utilizing natural forces; the arrangement and relation of parts, or the parts collectively, in any machine, tool, or other contrivance; means of mechanical action; machinery; hence, the structure of anything that is conceived to resemble a machine.n. A mechanical contrivance or agency of any kind; in general, the apparatus, means, or mode by which particular effects are produced or purposes accomplished: as, the mechanism of a musical instrument (the apparatus by means of which the performer acts upon it); the mechanism of a play or of a poem; the mechanism of government.n. Action according to the laws of mechanics; mechanical action.