What is One-shot?

One-shot definition and meaning on Dictionary terms:
noun Also one shot.
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.