seclusion n.

1620s, "exclusion, action of excluding" (a sense now obsolete), from Medieval Latin seclusionem (nominative seclusio), noun of action from past-participle stem of Latin secludere "to shut off, confine" (see seclude). The meaning "act or state of being shut out or keeping apart" is by 1784. Blount's "Glossographia" (1656) has seclusory (n.) "a place where any thing is shut up a part from another."