Usually means: Connects alternatives, expands possible choices.
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We found 69 dictionaries that define the word or:

General (30 matching dictionaries)
  1. OR, -or, or: Merriam-Webster.com
  2. OR, OR, -or, -or, -or, -or, or, or: Oxford Learner's Dictionaries
  3. OR, OR, or, or, or: American Heritage Dictionary of the English Language
  4. -or, or: Collins English Dictionary
  5. OR, or: Vocabulary.com
  6. O'R, OR, O'r, Or, -or, o'r, or, or, or, or, or, oR: Wordnik
  7. OR, -or, or: Cambridge Advanced Learner's Dictionary
  8. OR, Or, -or, or, or-: Wiktionary
  9. -or, or: Webster's New World College Dictionary, 4th Ed.
  10. OR, -or, or: The Wordsmyth English Dictionary-Thesaurus
  11. or: Infoplease Dictionary
  12. Or, -or, o.r, or: Dictionary.com
  13. -or, or: Online Etymology Dictionary
  14. or: Cambridge Essential American English Dictionary
  15. O.R, OR, Or (Crimea), Or (My Treasure), Or (album), Or (heraldry), Or (tincture), Or, -or: Wikipedia, the Free Encyclopedia
  16. Or, -or: Online Plain Text English Dictionary
  17. or: Webster's Revised Unabridged, 1913 Edition
  18. Or: Rhymezone
  19. or, or (m): AllWords.com Multi-Lingual Dictionary
  20. or: Webster's 1828 Dictionary
  21. -or, or: MyWord.info
  22. O.R, OR: Stammtisch Beau Fleuve Acronyms
  23. or: Free Dictionary
  24. or, or, or, or, or, or, or: The Phrontistery - A Dictionary of Obscure Words
  25. or: Mnemonic Dictionary
  26. O.R, OR: Dictionary/thesaurus
  27. or: Wikimedia Commons US English Pronunciations
  28. or: AllWords.com Multi-Lingual Dictionary

Art (7 matching dictionaries)
  1. or: ArtLex Lexicon of Visual Art Terminology
  2. An Illustrated Dictionary of Jewelry (No longer online)
  3. Warhammer Dwarven Word List (No longer online)
  4. Shakespeare Glossary (No longer online)
  5. -or, or-, or-: A Cross Reference of Latin and Greek Elements
  6. Glossary of Stamp Collecting Terms (No longer online)
  7. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (6 matching dictionaries)
  1. O.R, or: Law.com Dictionary
  2. Everybody's Legal Dictionary (No longer online)
  3. Bouvier's Law Dictionary 1856 Edition (No longer online)
  4. O.R, O.R, Or: Legal dictionary
  5. Glossary of Trade and Shipping Terms (No longer online)
  6. Accounting, Business Studies and Economics Dictionary (No longer online)

Computing (6 matching dictionaries)
  1. OR: Free On-line Dictionary of Computing
  2. OR: CCI Computer
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. OR: Computer Telephony & Electronics Dictionary and Glossary
  5. or: Dictionary of Algorithms and Data Structures
  6. O.R, Or (Afghanistan), or: Encyclopedia

Medicine (5 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. OR (abbreviation): MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. O.R, OR, or-: Medical dictionary
  5. OR (abbreviation): Drug Medical Dictionary

Miscellaneous (5 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. Arms and Armour (No longer online)
  3. OR: Acronym Finder
  4. AbbreviationZ (No longer online)
  5. United States Postal Service Official Abbreviations (No longer online)

Science (5 matching dictionaries)
  1. OR, Or: Eric Weisstein's World of Mathematics
  2. or: Extragalactic Astronomy
  3. OR: A Dictionary of Quaternary Acronyms and Abbreviations
  4. or: WebElements Periodic Table of the Elements
  5. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. O.R, O.R, OR (Original Rude), OR: Urban Dictionary

Tech (4 matching dictionaries)
  1. OR: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. or: Mining Terms used in mid 1800's
  4. Rane Professional Audio Reference (No longer online)

(Note: See oring as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (heraldry) The gold or yellow tincture on a coat of arms.
adjective:  (heraldry) Of gold or yellow tincture on a coat of arms.
adverb:  (obsolete) Early (on).
adverb:  (obsolete) Earlier, previously.
noun:  (logic) The binary operator inclusive or, true if one at least one of two inputs is true. In infix notation.
noun:  Oregon, a state of the United States of America.
noun:  Orissa, a state of India.
noun:  A surname.
noun:  (logic, electronics) Alternative form of OR [(logic) The binary operator inclusive or, true if one at least one of two inputs is true. In infix notation.]
noun:  (healthcare, countable) Initialism of operating room. [A room in a hospital used for performing surgical operations.]
noun:  (Philippines, accounting, business, countable) Initialism of official receipt.
noun:  (sciences, uncountable) Initialism of operations research. [(operations) The application of scientific methods and techniques to problems of decision making, especially in business management and government administration.]
noun:  (sports, countable) Initialism of Olympic Record.
noun:  (anatomy, countable) Initialism of odorant receptor.
noun:  (anatomy, countable) Initialism of olfactory receptor.
noun:  (chiefly Wikimedia jargon) Initialism of original research.
noun:  (military) Initialism of other ranks.

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