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Ab

1 American  
[ahb, ahv] / ɑb, ɑv /

noun

  1. Av.

Ab 2 American  
Symbol.

  1. Chemistry. alabamine.

  2. Immunology. antibody.

AB 3 American  

abbreviation

  1. Nautical. able seaman.

  2. airborne.

  3. U.S. Air Force. Airman Basic.

  4. Alberta, Canada (approved for postal use).

  5. antiballistic; antiballistic missile.

AB 4 American  
Symbol, Physiology.

  1. a major blood group usually enabling a person whose blood is of this type to donate blood to persons of type AB and to receive blood from persons of type O, A, B, or AB.

ab- 5 American  

  1. a formal element occurring in loanwords from Latin, where it meant “away from”.

    abdicate; abolition.
ab. 6 American  

abbreviation

  1. about.

  2. Baseball. (times) at bat.

A.B. 7 American  

abbreviation

  1. Bachelor of Arts.

A.B. 8 American  

abbreviation

  1. Nautical. able seaman.

  2. Baseball. (times) at bat. Also a.b.

AB 1 British  

abbreviation

  1. Also: a.b..  able-bodied seaman

  2. (in the US) Bachelor of Arts

  3. (esp in postal addresses) Alberta (Canada)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

symbol

  1. a human blood type of the ABO group, containing both the A antigen and the B antigen

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Ab 2 British  
/ æb /

noun

  1. a variant of Av

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
ab- 3 British  

prefix

  1. away from; off; outside of; opposite to

    abnormal

    abaxial

    aboral
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
ab- 4 British  

prefix

  1. denoting a cgs unit of measurement in the electromagnetic system

    abvolt
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of ab-5

< Latin ab (preposition and prefix) from, away, cognate with Greek apó, Sanskrit ápa, German ab, English of 1, off

Origin of A.B.7

< New Latin, Medieval Latin Artium Baccalaureus

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The testosterone-based view of Ab Ex is entrenched, but recent scholarship has focused attention elsewhere.

From The Wall Street Journal • Feb. 28, 2026

So it felt like Ab to Abby was a very cute jump.

From Salon • Jun. 29, 2025

Ab Inbev said its own internal data showed about 80% of consumers in the US remain favourable or neutral toward the Bud Light brand.

From BBC • Aug. 3, 2023

More to the point, while loose, brushy, sometimes energetic paint-handling is on vibrant display, as it was in the Ab Ex heyday, the way he puts that technique to work is what matters most.

From Los Angeles Times • Dec. 8, 2022

He hobbles along the streets calling, Anna Lie Sweets Lie, which doesn’t sound a bit like Limerick Leader and it doesn’t matter because everyone knows this is Ab Sheehan that was dropped on his head.

From "Angela's Ashes: A Memoir" by Frank McCourt

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.