Dissociate, v. t. [imp. & p. p. Dissociated; p. pr. & vb. n. Dissociating.] — Webster enters it under “dissociate”
Etymology: [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.
Shades of meaning
Fernald lists dissociated only as an antonym, under mutual.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given