• Webster's Revised Unabridged Dictionary
    • Coactive Acting in concurrence; united in action. "With what's unreal thou coactive art."
    • Coactive Serving to compel or constrain; compulsory; restrictive. "Any coactive power or the civil kind."
    • ***
Century Dictionary and Cyclopedia
    • coactive Forcing; compulsory; having the power to impel or restrain.
    • coactive Acting in concurrence.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Coactive (Shak.) acting together
    • adj Coactive compulsory
    • ***


Webster's Revised Unabridged Dictionary
In sense 1, fr. 1st Coact; in sense 2, fr. 2d Coact
Chambers's Twentieth Century Dictionary
L. cogĕre, coactum, to compel.


In literature:

The pope hath also not only directive, but coactive power over the faithful.
"Monks, Popes, and their Political Intrigues" by John Alberger

In science:

Parmacek, M. S., 2007 Myocardin-related transcription factors: critical coactivators regulating cardiovascular development and adaptation.
Robust identification of local adaptation from allele frequencies