coaction

There was one direct coaction between these two species observed.

One is constraint; the same is otherwise called force, compulsion, and coaction; which is a person's being necessitated to do a thing contrary to his will.

Antonyms: incomprehension, inapprehension. comprise, v. comprehend, include, embrace, involve, contain, embody. compulsion, n. constraint, coercion, obligation, coaction.