(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 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.

In a mechanistic, impersonal or automatic manner. / (not comparable) In terms of a mechanism.

Alternative form of quantum mechanical

Having the impersonal and automatic characteristics of a machine. / Predetermined by, or as if by, a mechanism. / (philosophy) Having a physical or biological cause.

Of or pertaining to quantum mechanics.

Non-Oxford British English standard spelling of mechanize.