Webster's Revised Unabridged Dictionary · 1913

Coact

Coact , transitive verb

[Latin coactare, intens. from cogere, coactum, to force. See Cogent.]

To force; to compel; to drive. [Obsolete]
The faith and service of Christ ought to be voluntary and not coacted. — Foxe

Coact , intransitive verb

[Prefix co- + act, v. i.]

To act together; to work in concert; to unite. [Obsolete]
But if I tell you how these two did coact. — Shakespeare