1. Action or activity in concert.
1659. H. More, Immort. Soul (1662), 203. This Sympathy and Coactivity. Ibid. (1662), Philos. Writings (1712), Pref. Gen. 14. Matter is destitute of vital Sympathy and Coactivity.
2. Coactive quality; compulsory character.
1738. Warburton, Div. Legat., I. 243. The coactivity of Civil Laws and Religion.