'Impulsion' definitions:

Definition of 'impulsion'

noun

A force that moves something along [syn: drift, impetus, impulsion]

noun

The act of applying force suddenly; "the impulse knocked him over" [syn: impulse, impulsion, impetus]

From: GCIDE

Impulsion \Im*pul"sion\, n. [L. impulsio: cf. F. impulsion. See Impel.] [1913 Webster]
1. The act of impelling or driving onward, or the state of being impelled; the sudden or momentary agency of a body in motion on another body; also, the impelling force, or impulse. "The impulsion of the air." --Bacon. [1913 Webster]
2. Influence acting unexpectedly or temporarily on the mind; sudden motive or influence; impulse. "The impulsion of conscience." --Clarendon. "Divine impulsion prompting." --Milton. [1913 Webster]