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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.

Some flirted only briefly with Ab Ex ideas before moving on.

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

The Taliban’s Transportation and Civil Aviation Ministry said in an online statement the plane was found in the district of Kuf Ab district, near the Aruz Koh mountain.

From Seattle Times • Jan. 22, 2024

Overall Ab Inbev performed better than many analysts expected.

From BBC • Aug. 3, 2023

Everyone calls him The Abbot or Ab Sheehan and no one knows why.

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.