An Etymological Dictionary of Astronomy and Astrophysics

A period during which a → planet, → asteroid, or → comet is observable, generally between two successive → conjunctions of the body with the Sun.

Etymology (EN): M.E. apparicioun, from O.Fr. apparition, from L.L. appritionem “an appearance,” from L. apparitus, p.p. of apparere “to appear.”

Etymology (PE): Padidâri, n. from → padidâr + -i; padidâreš, verbal n. from *padidâridan.