Noun
1. the atomic process that occurs during a chemical reaction;
"he determined unique mechanisms for the photochemical reactions"2. the technical aspects of doing something;
"a mechanism of social control""mechanisms of communication""the mechanics of prose style"3. a natural object resembling a machine in structure or function;
"the mechanism of the ear""the mechanism of infection"4. (philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes
5. device consisting of a piece of machinery; has moving parts that perform some function