Definitions from Wiktionary (once)

▸ adverb:  (frequency) One and only one time.
▸ adverb:  (temporal location) Formerly; during some period in the past.
▸ adverb:  (chiefly obsolete) At any time; ever.
▸ adverb:  (obsolete) One day, someday.
▸ adverb:  (mathematics) Multiplied by one: indicating that a number is multiplied by one.
▸ noun:  (fandom slang) A fan of the Korean girl band Twice.
▸ noun:  Obsolete form of ounce. [An avoirdupois ounce, weighing ¹⁄₁₆ of an avoirdupois pound, or 28.349523125 grams.]
▸ Also see once

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