1. retirement, privacy. Solitude,isolation refer to a state of being or living alone. Solitude emphasizes the quality of being or feeling lonely and deserted: to live in solitude.Isolation may mean merely a detachment and separation from others: to be put in isolation with an infectious disease.2. loneliness. 3. desert, wilderness.
mid-14c., from Old French solitude "loneliness" (14c.) and directly from Latin solitudinem (nominative solitudo) "loneliness, a being alone; lonely place, desert, wilderness," from solus "alone" (see sole (adj.)). "Not in common use in English until the 17th c." [OED]
A man can be himself only so long as he is alone; ... if he does not love solitude, he will not love freedom; for it is only when he is alone that he is really free. [Schopenhauer, "The World as Will and Idea," 1818]
Solitudinarian "recluse, unsocial person" is recorded from 1690s.