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Definition of once : 1. At any one time; - often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.
2. At some one period of time; - used indefinitely.
3. By limitation to the number one; for one time; not twice nor any number of times more than one.

Synonyms:

in one case, one, at once, aforetime, already, twice, formerly, previously, beforetime, at one time, one time, once only, before, erstwhile, uniquely, precede, erst, at a time, earlier

Usage examples:

• Come back at once! - "The Obstacle Race", Ethel M. Dell.
• Socrates is not at once good and not- good. - "Logic, Inductive and Deductive", William Minto.
• The judge was not quite so sure as he had been once. - "Orley Farm", Anthony Trollope.