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We found 32 dictionaries with English definitions that include the word optional:
Click on the first link on a line below to go directly to a page where "optional" is defined.

General dictionaries General (27 matching dictionaries)
  1. optional: Merriam-Webster.com [home, info]
  2. optional: Oxford Dictionaries [home, info]
  3. optional: American Heritage Dictionary of the English Language [home, info]
  4. optional: Collins English Dictionary [home, info]
  5. optional: Vocabulary.com [home, info]
  6. optional: Macmillan Dictionary [home, info]
  7. Optional, optional: Wordnik [home, info]
  8. optional: Cambridge Advanced Learner's Dictionary [home, info]
  9. Optional: Wiktionary [home, info]
  10. optional: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. optional: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. optional: Infoplease Dictionary [home, info]
  13. Optional, optional: Dictionary.com [home, info]
  14. optional: UltraLingua English Dictionary [home, info]
  15. optional: Cambridge Dictionary of American English [home, info]
  16. Optional: Online Plain Text English Dictionary [home, info]
  17. optional: Webster's Revised Unabridged, 1913 Edition [home, info]
  18. optional: Rhymezone [home, info]
  19. optional, optional: AllWords.com Multi-Lingual Dictionary [home, info]
  20. optional: Webster's 1828 Dictionary [home, info]
  21. optional: Free Dictionary [home, info]
  22. optional: Mnemonic Dictionary [home, info]
  23. optional: WordNet 1.7 Vocabulary Helper [home, info]
  24. optional: LookWAYup Translating Dictionary/Thesaurus [home, info]
  25. optional: Dictionary/thesaurus [home, info]

Art dictionaries Art (1 matching dictionary)
  1. optional: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business dictionaries Business (2 matching dictionaries)
  1. optional: Travel Industry Dictionary [home, info]
  2. optional: Legal dictionary [home, info]

Science dictionaries Science (1 matching dictionary)
  1. optional: PlanetMath Encyclopedia [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. optional: Urban Dictionary [home, info]

Quick definitions from Macmillan (
American English Definition British English Definition

Provided by

Quick definitions from WordNet (optional)

adjective:  possible but not necessary; left to personal choice

Words similar to optional

Usage examples for optional

Popular nouns described by optional

Words that often appear near optional

Rhymes of optional

Invented words related to optional

Phrases that include optional:   optional payment bond, optional referendum, clothes optional, clothing optional bike rides, doob's optional sampling theorem, more...

Words similar to optional:   optionality, optionally, elective, extra, more...

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