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propulsion (n.)

1610s, "expulsion, action of driving away" (a sense now obsolete), noun of action from propuls-, past-participle stem of Latin propellere "to propel" (see propel). The meaning "act of driving forward; propulsive force" is attested by 1799.

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Definitions of propulsion from WordNet

propulsion (n.)
a propelling force;
propulsion (n.)
the act of propelling;
Synonyms: actuation
From wordnet.princeton.edu