impulsĭo | inp- (noun F) : (), , impello
* A pushing against.
* Lit., external pressure,influence: omnis coagmentatio corporis vel calore vel frigore vel aliqua impulsione vehementi labefactatur et frangitur,Cic. Univ. 5, 14.
* Trop., incitement, instigation, impulse.
* In gen.: impulsio est, quae sine cogitatione per quandam affectionem animi facere aliquid hortatur, ut amor, iracundia, aegritudo,Cic. Inv. 2, 5, 17; cf. id. ib. § 19; 2, 6, 20.
* In partic.: ad hilaritatem impulsio, pleasantry, an incitement to merriment, = Gr. χαριεντισμός, a figure of speech, Cic. de Or. 3, 53, 205; Quint. 9, 1, 31; 9, 2, 3.

s. TLL