Usually means: Title of respect for men.
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We found 45 dictionaries that define the word sir:

General (27 matching dictionaries)
  1. sir: Merriam-Webster.com
  2. Sir, Sir, sir: Oxford Learner's Dictionaries
  3. Sir, sir: American Heritage Dictionary of the English Language
  4. sir: Collins English Dictionary
  5. Sir, sir: Vocabulary.com
  6. SIr, Sir, sir, sir, sir: Wordnik
  7. Sir, sir: Cambridge Advanced Learner's Dictionary
  8. SIR, Sir, sir: Wiktionary
  9. sir: Webster's New World College Dictionary, 4th Ed.
  10. sir: The Wordsmyth English Dictionary-Thesaurus
  11. sir: Infoplease Dictionary
  12. SIR, Sir: Dictionary.com
  13. sir: Online Etymology Dictionary
  14. sir: Cambridge Essential American English Dictionary
  15. SIR, Sir (album), Sir (disambiguation), Sir (film), Sir (singer), Sir: Wikipedia, the Free Encyclopedia
  16. Sir: Online Plain Text English Dictionary
  17. sir: Webster's Revised Unabridged, 1913 Edition
  18. sir: Rhymezone
  19. sir: AllWords.com Multi-Lingual Dictionary
  20. sir: Webster's 1828 Dictionary
  21. SIR: Stammtisch Beau Fleuve Acronyms
  22. Sir: Dictionary of Phrase and Fable (1898)
  23. sir: Free Dictionary
  24. sir: Mnemonic Dictionary
  25. Sir, sir: Dictionary/thesaurus

Art (2 matching dictionaries)
  1. Shakespeare Glossary (No longer online)
  2. sir-: A Cross Reference of Latin and Greek Elements

Computing (4 matching dictionaries)
  1. SIR: Free On-line Dictionary of Computing
  2. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  3. SIR: Computer Telephony & Electronics Dictionary and Glossary
  4. Sir: Encyclopedia

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

Miscellaneous (4 matching dictionaries)
  1. Arms and Armour (No longer online)
  2. SIR: Acronym Finder
  3. SIR: Three Letter Words with definitions
  4. AbbreviationZ (No longer online)

Slang (2 matching dictionaries)
  1. Sir: Green’s Dictionary of Slang
  2. s.i.r, sir: Urban Dictionary

Sports (1 matching dictionary)
  1. Sir: Dan's Poker

Tech (3 matching dictionaries)
  1. SIR: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. AUTOMOTIVE TERMS (No longer online)
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

(Note: See siring as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A man of a higher rank or position.
noun:  A respectful term of address to a man of higher rank or position, particularly:
noun:  to a knight or other low member of the peerage.
noun:  to a superior military officer.
noun:  to a teacher.
noun:  A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.
verb:  (transitive, informal) To address another individual using "sir".
noun:  (British) The titular prefix given to a knight or baronet.
noun:  (Philippines, colloquial or informal) A respectful term of address or reference to a man of higher rank or position before the man's given name or nickname.
noun:  Alternative letter-case form of sir. [A man of a higher rank or position.]
noun:  Alternative form of Syr [(uncommon) Synonym of Syr Darya]
noun:  (manufacturing) Initialism of surface insulation resistance.
noun:  (biochemistry, genetics) Abbreviation of silent information regulator.
adjective:  (epidemiology) Initialism of susceptible-infected/infectious-removed/recovered.

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    royal blue,     burgundy,     charcoal,     forest green,     maroon, more...



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