Usually means: Prefix meaning away, from, off.
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We found 58 dictionaries that define the word ab:

General (26 matching dictionaries)
  1. AB, Ab, ab, ab-: Merriam-Webster.com
  2. AB, AB, AB, Ab, Ab, ab-: Oxford Learner's Dictionaries
  3. A.B, AB, AB, Ab, ab, ab, ab, ab-, ab-: American Heritage Dictionary of the English Language
  4. Ab, a[?]b, ab-: Collins English Dictionary
  5. AB, Ab, ab: Vocabulary.com
  6. AB, Ab, Ab, Ab, ab, ab-, aB: Wordnik
  7. AB, ab: Cambridge Advanced Learner's Dictionary
  8. A.B, AB, -ab, a.b, ab, ab-: Wiktionary
  9. Ab, ab-: Webster's New World College Dictionary, 4th Ed.
  10. A.B, AB, ab-: The Wordsmyth English Dictionary-Thesaurus
  11. Ab: Infoplease Dictionary
  12. A.B, Ab-, ab, ab, ab-: Dictionary.com
  13. a.b, ab: Cambridge Essential American English Dictionary
  14. A.B, AB (disambiguation), AB, AB, Ab (Egyptian heart-soul concept), Ab (Semitic), Ab (cuneiform), Ab (father), Ab (given name), Ab: Wikipedia, the Free Encyclopedia
  15. Ab-, Ab: Online Plain Text English Dictionary
  16. ab, ab-: Webster's Revised Unabridged, 1913 Edition
  17. Ab: Rhymezone
  18. Ab-, Ab: AllWords.com Multi-Lingual Dictionary
  19. ab: Webster's 1828 Dictionary
  20. ab-: MyWord.info
  21. AB, ab, ab-: Stammtisch Beau Fleuve Acronyms
  22. A.B, Ab: Dictionary of Phrase and Fable (1898)
  23. ab, ab-: Free Dictionary
  24. ab: Mnemonic Dictionary
  25. A.B, Ab, ab, ab-: Dictionary/thesaurus
  26. ab: Merriam-Webster.com

Art (5 matching dictionaries)
  1. Beading Glossary (No longer online)
  2. Technical Glossary of Theatre Terms (No longer online)
  3. ab: Cooking Dictionary
  4. ab-: A Cross Reference of Latin and Greek Elements
  5. Glossary of Stamp Collecting Terms (No longer online)

Business (3 matching dictionaries)
  1. Ab: Webster's New World Finance & Investment Dictionary
  2. ab: Financial dictionary
  3. Glossary of Trade and Shipping Terms (No longer online)

Computing (4 matching dictionaries)
  1. AB: Free On-line Dictionary of Computing
  2. AB: Netlingo
  3. SMS Dictionary (No longer online)
  4. ab, ab-: Encyclopedia

Medicine (9 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Ab-: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. GASTROLAB Digestive Dictionary (No longer online)
  5. Hepatitis C Information Central (No longer online)
  6. Allergy Glossary (No longer online)
  7. Multiple Sclerosis Encyclopaedia (No longer online)
  8. A.B, Ab (disambiguation), Ab, ab-: Medical dictionary
  9. Ab-: Drug Medical Dictionary

Miscellaneous (3 matching dictionaries)
  1. ab, ab, ab: Terminology and Descriptions of Geneaological Words
  2. AB: Acronym Finder
  3. AbbreviationZ (No longer online)

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

Science (3 matching dictionaries)
  1. ab: Dictionary of Botanical Epithets
  2. AB: A Dictionary of Quaternary Acronyms and Abbreviations
  3. How Many? A Dictionary of Units of Measurement (No longer online)

Slang (2 matching dictionaries)
  1. ab, ab, ab, ab, ab, ab: Green’s Dictionary of Slang
  2. A.B, A.B, AB: Urban Dictionary

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

(Note: See abing as well.)

Definitions from Wiktionary (Ab)

noun:  (slang) An abscess caused by injecting an illegal drug, usually heroin.
verb:  (climbing, informal) To abseil.
noun:  (US) The early stages of; the beginning process; the start.
noun:  A blood type of the ABO system that has both blood antigens and may receive all blood types, and donate to AB.
noun:  (countable) A person with this blood type.
noun:  (Australia, Adelaide, countable) A kind of halal snack pack.
noun:  (immunology) Antibody.
noun:  (Judaism) Av.
noun:  A diminutive of the male given name Abner, from Hebrew, occasionally used as a formal given name.
noun:  (dated) In Egyptian belief, the heart and will and conscience of a person, especially that of the recently deceased which proceeds to the afterlife and is weighed as evidence during his or her judgement.
noun:  (dated) An Ancient Egyptian amulet in the shape of a heart (ib).
noun:  (informal) Clipping of abdominal muscle. [(often in the plural) Any of a group of four muscles that form the abdominal wall.]
verb:  Abbreviation of abort. [(intransitive, now rare outside medicine) To miscarry; to bring forth (non-living) offspring prematurely.]
noun:  Abbreviation of abortion. [(medicine) The expulsion from the womb of a foetus or embryo before it is fully developed, with loss of the foetus.]
adverb:  Abbreviation of about. [On all sides; around.]
noun:  Abbreviation of Alberta, a province of Canada. [A province in western Canada. Capital: Edmonton.]
noun:  Initialism of Artium baccalaureus.
noun:  Initialism of Aryan Brotherhood, a US white supremacist, neo-Nazi prison gang and crime syndicate.
noun:  Initialism of able seaman; able-bodied seaman. [(nautical) Synonym of able-bodied seaman.]
noun:  Initialism of afterburner. [(aviation) A device in a jet engine which injects fuel into the exhaust system to increase the thrust.]
noun:  Initialism of aid to the blind.
noun:  (military, aviation) Initialism of airbase.
noun:  (organic chemistry) Abbreviation of alkylbenzene. [(organic chemistry) Any hydrocarbon formally derived from benzene by replacing one or more hydrogen atoms with alkyl groups]
noun:  (medicine) Initialism of antibody. [(immunology) A protein produced by B-lymphocytes that binds to a specific antigen.]
noun:  Initialism of artificial breeding.
noun:  (law, politics) Initialism of assembly bill.
noun:  (ABDL) Initialism of adult baby. [(sexuality, ABDL) A person who has a paraphilia involving role-playing a regression to an infant-like state, wearing diapers, etc.]
noun:  Initialism of asymmetric bars. [(gymnastics) The uneven bars.]
adjective:  Initialism of airborne. [In or carried by the air.]
adjective:  Initialism of antiballistic. [(military, of a missile, or system) designed to detect, intercept, and destroy a ballistic missile in flight]
adjective:  (baseball) Initialism of at bat.
noun:  (title) Abbreviation of Abbot. [A surname.]

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