Usually means: One time; at some point.
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We found 39 dictionaries that define the word once:

General (30 matching dictionaries)
  1. once: Merriam-Webster.com
  2. once: Oxford Learner's Dictionaries
  3. once: American Heritage Dictionary of the English Language
  4. once: Collins English Dictionary
  5. once: Vocabulary.com
  6. Once: Wordnik
  7. the once: Cambridge Advanced Learner's Dictionary
  8. once: Wiktionary
  9. once: Webster's New World College Dictionary, 4th Ed.
  10. once: The Wordsmyth English Dictionary-Thesaurus
  11. once: Infoplease Dictionary
  12. Once, once: Dictionary.com
  13. once: Online Etymology Dictionary
  14. once: Cambridge Essential American English Dictionary
  15. ONCE (cycling team), ONCE, Once (Diana Vickers song), Once (Liam Gallagher song), Once (Morris Gleitzman novel), Once (Nightwish album), Once (Pearl Jam song), Once (Roy Harper album), Once (TV series), Once (The Tyde album), Once (film), Once (musical), Once (novel), Once (singer), Once (song), Once (soundtrack), Once, The Once: Wikipedia, the Free Encyclopedia
  16. Once: Online Plain Text English Dictionary
  17. once: Webster's Revised Unabridged, 1913 Edition
  18. once: Rhymezone
  19. once, once, once (f): AllWords.com Multi-Lingual Dictionary
  20. once: Webster's 1828 Dictionary
  21. ONCE: Stammtisch Beau Fleuve Acronyms
  22. once: Free Dictionary
  23. once: Mnemonic Dictionary
  24. once: LookWAYup Translating Dictionary/Thesaurus
  25. once: Dictionary/thesaurus
  26. once: Wikimedia Commons US English Pronunciations
  27. Once, once: Wordnik
  28. once: Cambridge Advanced Learner's Dictionary

Art (1 matching dictionary)
  1. Shakespeare Glossary (No longer online)

Business (1 matching dictionary)
  1. Once (album), once: Legal dictionary

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (4 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. ONCE: Acronym Finder
  3. AbbreviationZ (No longer online)
  4. once: Idioms

Slang (2 matching dictionaries)
  1. once, once, once: Green’s Dictionary of Slang
  2. once: Urban Dictionary

(Note: See onces as well.)

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Definitions from Wiktionary (
)
American English Definition British English Definition
▸ 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:  Obsolete form of ounce. [An avoirdupois ounce, weighing ¹⁄₁₆ of an avoirdupois pound, or 28.349523125 grams.]

Similar:
onetime, when, sometime, formerly, past, quondam, erstwhile, former, at one time, in one case, more...

Opposite:
repeatedly, often, frequently, habitually, continually

Phrases:
at once, once again, once more, for once, the once, more...

Adjectives:
everything, try, every, own, last, write, convict, rudest, how, repeat, prince

Colors:
    silver,     gold,     emerald,     ruby,     sapphire,     amethyst,     topaz,     pearl,     onyx,     jade


▸ Word origin

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▸ Usage examples for once

▸ Idioms related to once

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Similar:
onetime, when, sometime, formerly, past, quondam, erstwhile, former, at one time, in one case, more...

Opposite:
repeatedly, often, frequently, habitually, continually

Phrases:
at once, once again, once more, for once, the once, this once, once only, once removed, once over, once returner, once in a while, once and for all, all at once, once in a blue moon, once upon a time, more...

Adjectives:
everything, try, every, own, last, write, convict, rudest, how, repeat, prince

Colors:
    silver,     gold,     emerald,     ruby,     sapphire,     amethyst,     topaz,     pearl,     onyx,     jade



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