Hypertext Webster Gateway: "pulsion"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pulsion \Pul"sion\, n. [L. pulsio, fr. pellere, pulsum, to
drive: cf. F. pulsion.]
The act of driving forward; propulsion; -- opposed to
{suction} or {traction}. [R.]
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