† disuˈnitionObs.rare. [f. disunite v., after unition.] The action of disuniting; disjunction, separation, disunion. 1611Cotgr.Abstraict, a seperation, disunition, disiunction.[1702Clarendon's Hist.Reb. xiv. §149 III. 444 Disunition [other edd. disunion] and distinction of Parties.]