Usually means: Typographic unit for measuring width.
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We found 62 dictionaries that define the word em:

General (28 matching dictionaries)
  1. EM, 'em, em, em-: Merriam-Webster
  2. EM, 'em, em, em-, em-: Oxford Learner's Dictionaries
  3. EM, em, em-, em-: American Heritage Dictionary of the English Language
  4. 'em, em, em-: Collins English Dictionary
  5. em: Vocabulary.com
  6. EM, Em, 'em, e'm, em, em, em, em-, eM, eM: Wordnik
  7. 'em, em-: Cambridge Advanced Learner's Dictionary
  8. EM, 'em, em, em-: Wiktionary
  9. em, em-: Webster's New World College Dictionary, 4th Ed.
  10. 'em, em-: The Wordsmyth English Dictionary-Thesaurus
  11. em: Infoplease Dictionary
  12. E.M, EM, 'Em, Em-, 'em, em-: Dictionary.com
  13. em-: Online Etymology Dictionary
  14. EM, Em (Cyrillic), Em (comic strip), Em (typography), Em: Wikipedia, the Free Encyclopedia
  15. 'Em, Em-, Em: Online Plain Text English Dictionary
  16. em, em-: Webster's Revised Unabridged, 1913 Edition
  17. em: Rhymezone
  18. Em-, Em: AllWords.com Multi-Lingual Dictionary
  19. em: Webster's 1828 Dictionary
  20. em, em-: MyWord.info
  21. EM, EM, em: Stammtisch Beau Fleuve Acronyms
  22. Em: Dictionary of Phrase and Fable (1898)
  23. em, em-: FreeDictionary.org
  24. em: The Phrontistery - A Dictionary of Obscure Words
  25. em: Mnemonic Dictionary
  26. EM, em-: TheFreeDictionary.com
  27. em: Wikimedia Commons US English Pronunciations
  28. em: Longman Dictionary of Contemporary English

Art (3 matching dictionaries)
  1. Em: Glossary of Binary Graphics
  2. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)
  3. em-: A Cross Reference of Latin and Greek Elements

Business (4 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. EM, EM: Bloomberg Financial Glossary
  3. EM: Financial dictionary
  4. BusinessDictionary.com (No longer online)

Computing (6 matching dictionaries)
  1. EM: Free On-line Dictionary of Computing
  2. EM: Netlingo
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. EM: Computer Telephony & Electronics Dictionary and Glossary
  5. SMS Dictionary (No longer online)
  6. em: Encyclopedia

Medicine (7 matching dictionaries)
  1. EM: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. EM (electron microscope): MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. Hepatitis C Information Central (No longer online)
  6. EM, em-: Medical dictionary
  7. EM (electron microscope): Drug Medical Dictionary

Miscellaneous (3 matching dictionaries)
  1. baby names list (No longer online)
  2. EM-, EM: Acronym Finder
  3. AbbreviationZ (No longer online)

Science (2 matching dictionaries)
  1. EM: A Dictionary of Quaternary Acronyms and Abbreviations
  2. How Many? A Dictionary of Units of Measurement (No longer online)

Slang (3 matching dictionaries)
  1. em: Green’s Dictionary of Slang
  2. Em: Dublin Slang and Phrasebook
  3. Em-, Em: Urban Dictionary

Tech (6 matching dictionaries)
  1. em: Webster's New World Telecom Dictionary
  2. E.M, EM: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  3. AUTOMOTIVE TERMS (No longer online)
  4. Basics of Space Flight Glossary (No longer online)
  5. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  6. Glossary of Agricultural Terms, Programs and Laws (No longer online)

Definitions from Wiktionary (EM)

noun:  The name of the Latin-script letter M/m.
noun:  (typography) A unit of measurement equal to the height of the type in use.
noun:  The name of the Cyrillic script letter М / м.
noun:  A diminutive of the female given names Emily, Emma, or Emmeline.
noun:  Short for Eminem. [(colloquial) A talented rapper, on the same level as the rapper Eminem.]
noun:  Alternative letter-case form of em [The name of the Latin-script letter M/m.]
noun:  (biology, countable) Initialism of Effective Microorganism.
noun:  (energy) Initialism of Energy Management.
noun:  (countable) Abbreviation of electron microscope. [Any of several forms of microscope that use a beam of electrons, rather than one of light, and thus has a much greater resolving power.]
noun:  (uncountable) Abbreviation of electron microscopy. [microscopy carried out using an electron microscope]
noun:  (uncountable) Initialism of electromagnetism. [A unified fundamental force that combines the aspects of electricity and magnetism and is one of the four fundamental forces. (technically it can be unified with weak nuclear to form electroweak) Its gauge boson is the photon.]
noun:  (criminal justice) Initialism of electronic monitoring.
noun:  (business) Initialism of emerging market. [(economics, finance, also attributive) A relatively less-developed country or other trading region undergoing significant growth in production, consumption, or foreign investment.]
noun:  (education) Initialism of English medium.
noun:  (military) Initialism of enlisted man.
adjective:  Abbreviation of electromagnetic. [Relating to electromagnetism.]

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