Usually means: Necessary; required by obligation or need.
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We found 36 dictionaries that define the word must:

General (26 matching dictionaries)
  1. must: Merriam-Webster.com
  2. must, must, must, must, must-: Oxford Learner's Dictionaries
  3. must, must, must, must, must: American Heritage Dictionary of the English Language
  4. must, must-: Collins English Dictionary
  5. must: Vocabulary.com
  6. Must, must: Wordnik
  7. must, must-: Cambridge Advanced Learner's Dictionary
  8. must: Wiktionary
  9. must: Webster's New World College Dictionary, 4th Ed.
  10. must: The Wordsmyth English Dictionary-Thesaurus
  11. must: Infoplease Dictionary
  12. must: Dictionary.com
  13. must (n1.), must (n2.), must (n3.), must (v.): Online Etymology Dictionary
  14. must: Cambridge Essential American English Dictionary
  15. Must (disambiguation), Must: Wikipedia, the Free Encyclopedia
  16. Must: Online Plain Text English Dictionary
  17. must: Webster's Revised Unabridged, 1913 Edition
  18. must: Rhymezone
  19. must: AllWords.com Multi-Lingual Dictionary
  20. must: Webster's 1828 Dictionary
  21. must: Free Dictionary
  22. must: Mnemonic Dictionary
  23. must, must-: Dictionary/thesaurus
  24. must: Wikimedia Commons US English Pronunciations

Art (2 matching dictionaries)
  1. Epicurus.com Wine Glossary (No longer online)
  2. Shakespeare Glossary (No longer online)

Computing (1 matching dictionary)
  1. must: Encyclopedia

Medicine (1 matching dictionary)
  1. MUST: Medical dictionary

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

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

Tech (2 matching dictionaries)
  1. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  2. Wine Glossary (No longer online)

(Note: See musting as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
verb:  (modal auxiliary, defective) To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a failure or negative consequence.
verb:  (modal auxiliary, defective) To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate.
verb:  (modal auxiliary, defective) Used to indicate that something is very likely, probable, or certain to be true.
noun:  Something that is mandatory or required.
noun:  The property of being stale or musty.
noun:  Something that exhibits the property of being stale or musty.
noun:  Fruit juice that will ferment or has fermented, usually from grapes.
verb:  (transitive) To make musty.
verb:  (intransitive) To become musty.
noun:  Alternative form of musth [A time during which male elephants exhibit increased levels of sexual activity and aggressiveness and often secrete leaking temporin from the sides of their heads.]

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    mustard,     ochre,     amber,     saffron,     gold, more...



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    mustard,     ochre,     amber,     saffron,     gold, more...



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