Separation, n.
Etymology: [L. separatio: cf. F. séparation.]
The act of separating, or the state of being separated, or separate. Specifically: (a) Chemical analysis. (b) Divorce. (c) (Steam Boilers) The operation of removing water from steam. Judicial separation (Law), a form of divorce; a separation of man and wife which has the effect of making each a single person for all legal purposes but without ability to contract a new marriage. Mozley & W.
Shades of meaning
Fernald lists separation only as an antonym, under alliance, association, attachment, harmony, union.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given