impellent

[im-pel-uhnt]
adjective
1.
impelling: an impellent power; an impellent cause.
noun
2.
something that impels; an impelling agency or force.

Origin:
1610–20; < Latin impellent- (stem of impellēns), present participle of impellere to set in motion. See impel, -ent

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World English Dictionary
impel (ɪmˈpɛl)
 
vb , -pels, -pelling, -pelled
1.  to urge or force (a person) to an action; constrain or motivate
2.  to push, drive, or force into motion
 
[C15: from Latin impellere to push against, drive forward, from im- (in) + pellere to drive, push, strike]
 
im'pellent
 
n, —adj

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Example sentences
Under the influence of offered hydraulic effect known impellent units are excluded: pumps, mechanical connections and pistons.
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