An Etymological Dictionary of Astronomy and Astrophysics

Pertaining to or affecting a particular person or a small group of persons; individual; → personal (Dictionary.com).

Etymology (EN): L. privatus “set apart, peculiar, personal,” used in contrast to publicus, p.p. of privare “to separate, deprive, to rob” from privus “one’s own, individual.”

Etymology (PE): Vâvan, literally “separated, not bound,” from vâ- separation prefix,
→ de-, + van, contraction of vand, band, from vastan, bastan “to bind, fasten, close,” → band.