Usually means: Available but not necessarily required.
Definitions Related words Phrases (New!) Mentions Lyrics History Colors (New!)
We found 28 dictionaries that define the word optional:

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

Art (1 matching dictionary)
  1. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (2 matching dictionaries)
  1. Travel Industry Dictionary (No longer online)
  2. optional: Legal dictionary

Science (1 matching dictionary)
  1. optional: PlanetMath Encyclopedia

Slang (1 matching dictionary)
  1. optional: Urban Dictionary

(Note: See optionality as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Not compulsory; left to personal choice; elective.
noun:  Something that is not compulsory, especially part of an academic course.
noun:  (programming, sometimes capitalized) In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.

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Similar:

Opposite:

Phrases:

Adjectives:

Colors:
    silver,     gray,     beige,     lavender,     light blue, more...



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