Usually means: Trigonometric function adjacent over hypotenuse.
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We found 46 dictionaries that define the word COS:

General (21 matching dictionaries)
  1. COS, COs, Cos, cos: Merriam-Webster
  2. Cos, 'cos, cos, cos, cos: Oxford Learner's Dictionaries
  3. Cos, cos, cos: American Heritage Dictionary of the English Language
  4. cos: Collins English Dictionary
  5. cos: Vocabulary.com
  6. CO'S, CO's, COs, Co's, Cos, Cos, co's, cos, cos: Wordnik
  7. 'cos, cos: Cambridge Advanced Learner's Dictionary
  8. Cos, 'cos, co's, cos: Wiktionary
  9. cos: Webster's New World College Dictionary, 4th Ed.
  10. Cos: The Wordsmyth English Dictionary-Thesaurus
  11. cos: Infoplease Dictionary
  12. C.O.S, cos, cos: Dictionary.com
  13. COS (clothing), COS (operating system), COS, CoS, Cos(x), Cos (TV series), Cos (island), Cos: Wikipedia, the Free Encyclopedia
  14. cos: Rhymezone
  15. COS: Stammtisch Beau Fleuve Acronyms
  16. cos: FreeDictionary.org
  17. cos: Mnemonic Dictionary
  18. Cos, 'cos, c.o.s: TheFreeDictionary.com
  19. cos: Longman Dictionary of Contemporary English

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Business (3 matching dictionaries)
  1. COs: Merriam-Webster Legal Dictionary
  2. cos: Legal dictionary
  3. cos: Financial dictionary

Computing (7 matching dictionaries)
  1. COS: Free On-line Dictionary of Computing
  2. COS: Netlingo
  3. COS: CCI Computer
  4. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  5. CoS (Class of Service): Linktionary Networking Glossary
  6. I T Glossary (No longer online)
  7. 'cos, cos: Encyclopedia

Medicine (3 matching dictionaries)
  1. COs: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. COS, 'cos: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. COS: Acronym Finder
  2. COS: Three Letter Words with definitions
  3. AbbreviationZ (No longer online)

Religion (1 matching dictionary)
  1. Cos: Smith's Bible Dictionary

Science (2 matching dictionaries)
  1. Cos: Eric Weisstein's World of Mathematics
  2. COS: Cytokines & Cells Online Pathfinder Encyclopaedia

Slang (1 matching dictionary)
  1. cos: Green’s Dictionary of Slang

Tech (4 matching dictionaries)
  1. cos: Webster's New World Telecom Dictionary
  2. COS: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  4. Rane Professional Audio Reference (No longer online)

(Note: See cosing as well.)

Definitions from Wiktionary (CoS)

noun:  (chiefly UK) Synonym of romaine lettuce, a long-leaved variety of lettuce.
noun:  (informal, African-American Vernacular) Alternative form of coz, cousin. [(informal) cousin (usually as a term of address)]
noun:  Alternative form of coss, a traditional Nepali unit of distance. [(British India, South Asia) A measure of distance, varying from one and a quarter to two and a half English miles.]
noun:  Alternative spelling of Kos, an island in the Aegean, Greece. [An island in the Dodecanese, Greece.]
noun:  Initialism of Chamber of Secrets.

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