Usually means: Inverse of the cosine function.
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We found 66 dictionaries that define the word sec:

General (23 matching dictionaries)
  1. sec: Longman Dictionary of Contemporary English
  2. SEC, sec: Merriam-Webster
  3. SEC, Sec, sec, sec, sec, sec: Oxford Learner's Dictionaries
  4. SEC, sec, sec, sec: American Heritage Dictionary of the English Language
  5. sec, sec: Collins English Dictionary
  6. SEC, sec: Vocabulary.com
  7. Sec, Sec, sec, sec: Wordnik
  8. sec: Cambridge Advanced Learner's Dictionary
  9. SEC, Sec, sec, sec-: Wiktionary
  10. sec: Webster's New World College Dictionary, 4th Ed.
  11. SEC, sec, sec: The Wordsmyth English Dictionary-Thesaurus
  12. sec: Infoplease Dictionary
  13. SEC(R), s.e.c, sec, sec: Dictionary.com
  14. sec: Cambridge Essential American English Dictionary
  15. SEC, Sec(x), Sec: Wikipedia, the Free Encyclopedia
  16. Sec: Rhymezone
  17. sec (sche): AllWords.com Multi-Lingual Dictionary
  18. SEC, sec: Stammtisch Beau Fleuve Acronyms
  19. sec: FreeDictionary.org
  20. sec: Mnemonic Dictionary
  21. SEC, sec: TheFreeDictionary.com

Art (6 matching dictionaries)
  1. Paris Cookbook (No longer online)
  2. Epicurus.com French Glossary (No longer online)
  3. Epicurus.com Food Glossary (No longer online)
  4. Epicurus.com Wine Glossary (No longer online)
  5. Virginia Tech Multimedia Music Dictionary (No longer online)
  6. sec-: A Cross Reference of Latin and Greek Elements

Business (17 matching dictionaries)
  1. SEC: Merriam-Webster Legal Dictionary
  2. MoneyGlossary.com (No longer online)
  3. S.E.C: Webster's New World Law Dictionary
  4. INVESTORWORDS (No longer online)
  5. SEC: Accounting Glossary
  6. Glossary of Legal Terms (No longer online)
  7. SEC: bizterms.net
  8. SEC, SEC: Bloomberg Financial Glossary
  9. SEC: Harvey Financial
  10. Glossary of Crop Abbreviations (No longer online)
  11. SEC: Deardorff's Glossary of International Economics
  12. SEC: Investopedia
  13. SEC: Securities Terminology
  14. SEC (disambiguation), SEC: Legal dictionary
  15. SEC (disambiguation), SEC: Financial dictionary
  16. Accounting, Business Studies and Economics Dictionary (No longer online)
  17. SEC: WashingtonPost.com: Business

Computing (5 matching dictionaries)
  1. SEC: Free On-line Dictionary of Computing
  2. sec: Netlingo
  3. SEC: CCI Computer
  4. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  5. SEC (disambiguation), sec: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Hepatitis C Information Central (No longer online)

Miscellaneous (4 matching dictionaries)
  1. sec, sec, sec: Terminology and Descriptions of Geneaological Words
  2. SEC(R), SEC: Acronym Finder
  3. SEC: Three Letter Words with definitions
  4. AbbreviationZ (No longer online)

Science (3 matching dictionaries)
  1. Sec: Eric Weisstein's World of Mathematics
  2. sec: MATH SPOKEN HERE!
  3. SEC: Extragalactic Astronomy

Slang (2 matching dictionaries)
  1. sec: Green’s Dictionary of Slang
  2. S.E.C, sec: Urban Dictionary

Tech (4 matching dictionaries)
  1. Basics of Space Flight Glossary (No longer online)
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. SEC (DRY), SEC: French-English Wine Glossary
  4. Glossary of Meteorology (No longer online)

(Note: See secs as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (colloquial) Second, ¹⁄₆₀ of a minute.
noun:  (colloquial) Clipping of second (“short indeterminate period of time”). [Something that is number two in a series.]
noun:  (colloquial, politics) Clipping of secretary. [(obsolete) Someone entrusted with a secret; a confidant.]
noun:  (US, government, finance) Initialism of Securities and Exchange Commission.
noun:  (US, college, sports) Abbreviation of Southeastern Conference, a college athletics conference
noun:  (Australia) Initialism of State Electricity Commission.
noun:  Initialism of scavenger endothelial cell.

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