reagency|riːˈeɪdʒənsɪ| [re- 2 a; cf. react v.1] Reactive power or operation. 1842Blackw. Mag. LI. 284 Christianity..as a re-agency of destruction to all forms of idolatrous error.1852De Quincey Confess. (1856) 12 The re-agency of these London sufferings did..enforce the use of opium.