pul·sion \ˈpəlshən\noun (-s) Etymology: Late Latin pulsion-, pulsio, from Latin pulsus (past participle of pellere to beat, drive, push) + -ion-, -io -ion — more at felt : the act or action of pushing or driving : propulsion < these undirected and hence uncoordinated pulsions, so prevalent in childhood — H.A.Murray > — opposed to traction