n. Automatic or involuntary action: in pathology, sometimes specifically applied to such purposeless actions as are often exhibited by patients after an epileptic fit.n. The doctrine that animals, especially those below man, are automata, in the sense that all the phenomena exhibited by them are results of physical laws; especially, the doctrine of Descartes that animals are devoid of consciousnessn. The faculty of independently originating action or motion.n. Specifically, in psychology: An action performed unconsciously or subconsciously while the agent's attention is otherwise engaged, or while he is in a trance or sleep-like state.n. The mental state of the agent during such a performance.