Dissociate \Dis*so"ci*ate\, v. t. [imp. & p. p. {Dissociated}; p. pr. & vb. n. {Dissociating}.] [L. dissociatus, p. p. of dissociare to dissociate; dis- + sociare to unite, associate, socius companion. See {Social}.] To separate from fellowship or union; to disunite; to disjoin; as, to dissociate the particles of a concrete substance. Before Wyclif's death in 1384, John of Gaunt had openly dissociated himself from the reformer. --A. W. Ward.