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

Of or pertaining to quantum mechanics.

Alternative form of quantum mechanical

(biology) The breaking of food into digestible chunks, normally using the teeth.

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

(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.

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.

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

(physics) The branch of physics that uses statistical laws to make theoretical predictions about macroscopic systems of particles.