a magazine, brochure, or the like that is published only one time, with no subsequent issues intended, usually containing articles and photographs devoted to one topical subject.

a single appearance by a performer, as in a play, motion picture, or television program.

a close-up camera shot of one person.

something occurring, done, used, etc., only once.

occurring, done, etc., only once.

achieved or accomplished with a single try

a one-shot solution.