from
The Collaborative International Dictionary of English v.0.48
dissociate \dis*so"ci*ate\ (d[i^]s*s[=o]"sh[i^]*[=a]t), 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.
[1913 Webster]
Before Wyclif's death in 1384, John of Gaunt had openly
dissociated himself from the reformer. --A. W. Ward.
[1913 Webster]