An act of becoming visible; appearance; visibility. / The thing appearing; a visible object; a form.

plural of apparition

(religion, forteana) Of or pertaining to an apparition or apparitions

(number theory) Given a positive integer m and a divisibility sequence Sₖ, the smallest index k such that Sₖ is divisible by m;

plural of rank of apparition

plural of apparitionist

A believer in apparitions.