Of or pertaining to quantum mechanics.

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.

(archaic) In the 19th century, engineering and other mechanical fields of expertise (comparable to performing arts and the fine arts).

Any mechanical (or other) system used to keep one or more variable parameters constant, or within specified bounds.

plural of control mechanism

(physics) Of, or relating to statistical mechanics.

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

Referring to a period before the mechanization of farming or some other human activity.

(chemistry) the ordered set of individual reactions whose overall effect is given by a chemical equation