(advertising) Manually created layout of artwork that is camera ready for photographic reproduction. / One who does manual labor, especially one who is similar to Shakespeare's rude mechanicals

(now rare) Characteristic of someone who does manual labour for a living; coarse, vulgar. / Related to mechanics (the branch of physics that deals with forces acting on mass).

(physics) The sum of the potential energy and kinetic energy of a body or system

plural of mechanical pencil

(Canada, US) A pencil with a replaceable and mechanically extendable lead that wears away with use, designed to provide lines of constant thickness without requiring sharpening, and typically featuring a small eraser at the end opposite the tip.

(engineering) The subfield of engineering concerned with designing and building machines and mechanical systems.

The ratio of the output force produced by a machine (especially a simple machine) to the applied input force.

In a mechanical manner.

(physics) Of, or relating to statistical mechanics.

Any part of a mechanism that exercises some form of logical control, such as a ratchet, trip, detent or interlock.