Usually means: Conditional statement determining possible outcomes.
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We found 43 dictionaries that define the word if:

General (28 matching dictionaries)
  1. if: Merriam-Webster.com
  2. IF, if: Oxford Learner's Dictionaries
  3. IF, if: American Heritage Dictionary of the English Language
  4. i.f, if: Collins English Dictionary
  5. if: Vocabulary.com
  6. IF, I'f, If, If, If, If, if, if, if, iF: Wordnik
  7. if: Cambridge Advanced Learner's Dictionary
  8. IF, if: Wiktionary
  9. if: Webster's New World College Dictionary, 4th Ed.
  10. if: The Wordsmyth English Dictionary-Thesaurus
  11. if: Infoplease Dictionary
  12. IF, i.f: Dictionary.com
  13. if: Online Etymology Dictionary
  14. if: Cambridge Essential American English Dictionary
  15. IF (DOS command), IF, If(we), If-, If... (Desperate Housewives), If... (TV series), If... (The Bluetones song), If... (comic), If (Bananarama song), If (Bread song), If (Glass Hammer album), If (If album), If (Janet Jackson song), If (Kana Nishino song), If (Magazine), If (Mata Aetara), If (Mindless Self Indulgence album), If (Pink Floyd song), If (Rudyard Kipling), If (They Made Me a King), If (Westlife song), If (band), If (conjunction), If (disambiguation), If (film), If (magazine), If: Wikipedia, the Free Encyclopedia
  16. If: Online Plain Text English Dictionary
  17. if: Webster's Revised Unabridged, 1913 Edition
  18. if, if (m): AllWords.com Multi-Lingual Dictionary
  19. if: Webster's 1828 Dictionary
  20. if: MyWord.info
  21. IF: Stammtisch Beau Fleuve Acronyms
  22. if: Free Dictionary
  23. if: The Phrontistery - A Dictionary of Obscure Words
  24. IF, i.f: Dictionary/thesaurus
  25. if: Wikimedia Commons US English Pronunciations
  26. If: Wordnik

Business (1 matching dictionary)
  1. Glossary of Trade and Shipping Terms (No longer online)

Computing (1 matching dictionary)
  1. If (island), if: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. IF, If(song), If (song), If, If: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. IF: Acronym Finder
  2. AbbreviationZ (No longer online)
  3. if: Idioms

Science (2 matching dictionaries)
  1. IF: Extragalactic Astronomy
  2. IF: Cytokines & Cells Online Pathfinder Encyclopaedia

Slang (1 matching dictionary)
  1. IF (idiotface), If: Urban Dictionary

Tech (5 matching dictionaries)
  1. IF: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. Glossary of Meteorology (No longer online)
  4. Sweetwater Music (No longer online)
  5. RF Terms Glossary (No longer online)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (informal) An uncertainty, possibility, condition, doubt etc.
noun:  Initialism of interactive fiction. [(literature, uncountable) Text adventures and their descendants.]
noun:  Initialism of impact factor. [A measure reflecting the average number of citations to recent articles published in an academic journal, used as an approximation of the relative importance of a journal within its field.]
noun:  (biochemistry) Initialism of intermediate filament. [(biochemistry) Any of a family of twisted protein filaments intermediate in size between microfilaments and microtubules.]
noun:  (electronics) Initialism of intermediate frequency. [(radio) A frequency to which a carrier frequency is shifted as an intermediate step in transmission or reception; generally associated with superheterodyne receivers.]
noun:  (nutrition) Initialism of intermittent fasting.

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