Usually means: Combining two numbers into one.
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We found 51 dictionaries that define the word addition:

General (28 matching dictionaries)
  1. addition: Merriam-Webster
  2. addition: Oxford Learner's Dictionaries
  3. addition: American Heritage Dictionary of the English Language
  4. addition: Collins English Dictionary
  5. addition: Vocabulary.com
  6. Addition, addition: Wordnik
  7. addition: Cambridge Advanced Learner's Dictionary
  8. addition: Wiktionary
  9. addition: Webster's New World College Dictionary, 4th Ed.
  10. addition: The Wordsmyth English Dictionary-Thesaurus
  11. addition: Infoplease Dictionary
  12. addition: Dictionary.com
  13. addition: Online Etymology Dictionary
  14. addition: Cambridge Essential American English Dictionary
  15. Addition (disambiguation), Addition: Wikipedia, the Free Encyclopedia
  16. Addition: Online Plain Text English Dictionary
  17. addition: Webster's Revised Unabridged, 1913 Edition
  18. addition: Rhymezone
  19. Addition (f), addition, addition (f): AllWords.com Multi-Lingual Dictionary
  20. addition: Webster's 1828 Dictionary
  21. addition: FreeDictionary.org
  22. addition: Mnemonic Dictionary
  23. addition: TheFreeDictionary.com
  24. addition: Wikimedia Commons US English Pronunciations
  25. addition: Longman Dictionary of Contemporary English
  26. addition: Merriam-Webster

Art (4 matching dictionaries)
  1. Paris Cookbook (No longer online)
  2. Epicurus.com French Glossary (No longer online)
  3. Epicurus.com Food Glossary (No longer online)
  4. Shakespeare Glossary (No longer online)

Business (3 matching dictionaries)
  1. Bouvier's Law Dictionary 1856 Edition (No longer online)
  2. addition: Legal dictionary
  3. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. addition: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. addition: Medical dictionary

Miscellaneous (5 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. Encyclopedia of Graphic Symbols (No longer online)
  3. Brilliant Dream Dictionary (No longer online)
  4. Sound-Alike Words (No longer online)
  5. addition: Idioms

Science (5 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. Addition: Eric Weisstein's World of Mathematics
  3. -addition (alpha-addition), addition: PHYSICAL ORGANIC CHEMISTRY
  4. addition, addition: PlanetMath Encyclopedia
  5. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (2 matching dictionaries)
  1. addition: Green’s Dictionary of Slang
  2. The addition: Urban Dictionary

Tech (1 matching dictionary)
  1. Glossary of Composite Terms (No longer online)

(Note: See additions as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) The act of adding anything.
noun:  Anything that is added.
noun:  (uncountable, arithmetic) The arithmetic operation of adding.
noun:  (music) A dot at the right side of a note as an indication that its sound is to be lengthened one half.
noun:  (chiefly law) A title annexed to a person's name to identify him or her more precisely.
noun:  (heraldry) Something added to a coat of arms, as a mark of honour.
noun:  (organic chemistry) an organic reaction where two or more molecules combine to form a larger one (the adduct).

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