(mechanics) The branch of mechanics dealing with gases and liquids, either at rest or in motion.

The application of mechanics (especially fluid mechanics) to soils, especially as a basis for the design and construction of building foundations and earthworks.

(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

(physics) Of, or relating to statistical mechanics.

(physics) All of the physical laws of nature that account for the behaviour of the normal world, but break down when dealing with the very small (see quantum mechanics) or the very fast or very heavy (see relativity).

(physics) Early classical mechanics as propounded by Isaac Newton, especially that based on his laws of motion and theory of gravity.

(physics) The branch of physics which studies matter and energy at the level of atoms and other elementary particles, and substitutes probabilistic mechanisms in place of classical Newtonian ones.