Webster’s Revised Unabridged Dictionary · 1913
Compulsion
Com·pul′sion (kŏm·pŭl′shŭn), n. [L. compulsio. See Compel.] The act of compelling, or the state of being compelled; the act of driving or urging by force or by physical or moral constraint; subjection to force.
If reasons were as plentiful as blackberries, I would give no man a reason upon compulsion. Shak.
With what compulsion and laborious flight We sunk thus low. Milton.
Syn. — See Constraint.