Of a theory or an advocate of a theory: explaining phenomena in terms of physical properties (esp. only in such terms). Now chiefly historical.

Of a theory or its advocates: explaining phenomena in terms of physical properties. Cf. mechanical, adj. 9. Obsolete.

Of or relating to mechanism (mechanism, n. 4); inclining towards or advocating mechanism.

of or relating to mechanical and physical processes; spec. of, relating to, or designating a philosophy that explains all phenomena as the outcome of…

Of or relating to theories which explain phenomena in purely physical or deterministic terms (cf. mechanism, n. 4) (sometimes spec. in Linguistics).

Of or relating to mechanicalism.