(astronomy) The dynamics of celestial bodies subject to mutual gravitational attraction.

(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

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.

Alternative form of quantum mechanical

Of or pertaining to quantum mechanics.

plural of auto mechanic

(US) A person skilled in repairing and maintaining automobiles and other motor vehicles.