Usually means: Beginning part of a word.
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We found 39 dictionaries that define the word Prefix:

General (27 matching dictionaries)
  1. prefix: Merriam-Webster.com
  2. prefix: Oxford Learner's Dictionaries
  3. prefix: American Heritage Dictionary of the English Language
  4. prefix: Collins English Dictionary
  5. prefix: Vocabulary.com
  6. Prefix, prefix: Wordnik
  7. prefix: Cambridge Advanced Learner's Dictionary
  8. prefix: Wiktionary
  9. prefix: Webster's New World College Dictionary, 4th Ed.
  10. prefix: The Wordsmyth English Dictionary-Thesaurus
  11. prefix: Infoplease Dictionary
  12. prefix: Dictionary.com
  13. prefix: Online Etymology Dictionary
  14. prefix: Cambridge Essential American English Dictionary
  15. Prefix (computer science), Prefix (disambiguation), Prefix (linguistics), Prefix: Wikipedia, the Free Encyclopedia
  16. Prefix: Online Plain Text English Dictionary
  17. prefix: Webster's Revised Unabridged, 1913 Edition
  18. prefix: Rhymezone
  19. prefix, prefix (het): AllWords.com Multi-Lingual Dictionary
  20. prefix: Webster's 1828 Dictionary
  21. prefix: MyWord.info
  22. prefix: Free Dictionary
  23. prefix: Mnemonic Dictionary
  24. prefix: Dictionary/thesaurus
  25. prefix: Wikimedia Commons US English Pronunciations

Art (2 matching dictionaries)
  1. Linguistic Glossary (No longer online)
  2. Prefix: Lexicon of Linguistics

Business (1 matching dictionary)
  1. Prefix (linguistics): Legal dictionary

Computing (3 matching dictionaries)
  1. prefix: Free On-line Dictionary of Computing
  2. prefix: Dictionary of Algorithms and Data Structures
  3. Prefix (computer science), prefix: Encyclopedia

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

Miscellaneous (1 matching dictionary)
  1. prefix: Idioms

Science (3 matching dictionaries)
  1. Prefix: Eric Weisstein's World of Mathematics
  2. prefix: PlanetMath Encyclopedia
  3. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

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

(Note: See prefixal as well.)

Definitions from Wiktionary (prefix)

noun:  Something placed before another
noun:  (grammar, linguistic morphology) A morpheme added to the beginning of a word to modify its meaning, for example as, pre- in prefix, con- in conjure, re- in reheat, etc.
noun:  (telecommunications) A set of digits placed before a telephone number, to indicate where the number is based, what type of phone number it is (landline, mobile, toll-free, premium rate etc.)
noun:  A title added to a person's name, such as Mr. or Dr.
noun:  (computing) An initial segment of a string of characters.
verb:  (transitive) To determine beforehand; to set in advance.
verb:  (transitive) To put or fix before, or at the beginning of something; to place at the start.

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