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.
The pope hath also not only directive, but coactive power over the faithful.
"Monks, Popes, and their Political Intrigues" by John Alberger
Parmacek, M. S., 2007 Myocardin-related transcription factors: critical coactivators regulating cardiovascular development and adaptation.
Robust identification of local adaptation from allele frequencies