Emily Dickinson Lexicon

once, adv. [OE eny.]

1. Formerly; in the past.
2. One time; in a solitary instance.
3. As soon as; when (conj. adv.).
4. Phrase. “At once”: simultaneously; the same point of time.
5. Phrase. “At once”: immediately; suddenly.
6. Phrase. “Once more”: again; another time; in another attempt.