Seclusion, n.
Etymology: [See Seclude.]
The act of secluding, or the state of being secluded; separation from society or connection; a withdrawing; privacy; as, to live in seclusion. O blest seclusion from a jarring world, which he, thus occupied, enjoys! Cowper.
Syn. -- Solitude; separation; withdrawment; retirement; privacy. See Solitude.
Shades of meaning
Fernald has no entry of its own for seclusion; he lists it under retirement.
Where he writes about it:
In seclusion one shuts himself away from the society of all except intimate friends or attendants; in solitude no other person is present. — from retirement
While seclusion is ordinarily voluntary, solitude may be enforced; we speak of the solitude rather than the seclusion of a prisoner. — from retirement
As "private" denotes what concerns ourselves individually, privacy denotes freedom from the presence or observation of those not concerned or whom we desire not to have concerned in our affairs; privacy is more commonly temporary than seclusion; we speak of a moment's privacy. — from retirement