Disband (; see Dis-), v. t. [imp. & p. p. Disbanded; p. pr. & vb. n. Disbanding.]
Etymology: [Pref. dis- + band: cf. OF. desbander, F. débander, to unbind, unbend. See Band, and cf. Disbend, Disbind.]
1. To loose the bands of; to set free; to disunite; to scatter; to disperse; to break up the organization of; especially, to dismiss from military service; as, to disband an army. They disbanded themselves and returned, every man to his own dwelling. Knolles.
2. To divorce. [Obs.] And therefore . . . she ought to be disbanded. Milton.
1 other Webster entry under this spelling
Disband, v. i.
To become separated, broken up, dissolved, or scattered; especially, to quit military service by breaking up organization.
When both rocks and all things shall disband. Herbert. Human society would in a short space disband. Tillotson.
Shades of meaning
Fernald lists disband only as an antonym, under convoke.
He lists it without comment; the entries above explain its neighbors.