What does once mean?

Looking for the meaning or definition of the word once? Here's what it means.

Adverb
  1. (frequency) One and only one time.
  2. (temporal location) Formerly; during some period in the past.
  3. (mathematics) Multiplied by one: indicating that a number is multiplied by one.
  4. As soon as.
  5. (obsolete) At a future time.
Conjunction
  1. As soon as; when; after.
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