To save this word, you'll need to log in.
\ ˈab 
\
\Definition of ab
(Entry 1 of 6)
: an abdominal muscle
—usually used in plural
ab
abbreviation (1)Definition of ab (Entry 2 of 6)
about
Ab
noun (2)\ ˈäb , ˈäv , ˈȯv \
, ˈäv , ˈȯv \Definition of Ab (Entry 3 of 6)
: the 11th month of the civil year or the 5th month of the ecclesiastical year in the Jewish calendar — see Months of the Principal Calendars Table
AB
noun (3)\ ˈā-ˈbē \
\Definition of AB (Entry 4 of 6)
: the one of the four ABO blood groups characterized by the presence of antigens designated by the letters A and B and by the absence of antibodies against these antigens
AB
abbreviation (2)Definition of AB (Entry 5 of 6)
1 able seaman; able-bodied seaman
2 airborne
3 airman basic
4 Alberta
5 abort; abortion
6
[New Latin artium baccalaureus] bachelor of arts
ab-
prefixDefinition of ab- (Entry 6 of 6)
: from : away : off
abaxial
Keep scrolling for more
Keep scrolling for more
More Definitions for ab
ab
nounEnglish Language Learners Definition of ab
informal : any one of the muscles that cover a person's stomach : an abdominal muscle
ab-
prefixKids Definition of ab-
: from : differing from
abnormal
AB
abbreviationKids Definition of AB
Alberta
ab
noun\ ˈab \
\Medical Definition of ab
(Entry 1 of 4)
: abdominal —usually used in plural highly developed abs ab exercises
ab
abbreviationMedical Definition of ab (Entry 2 of 4)
1 or AB abort; abortion
2 about
AB
noun\ ˈā-ˈbē \
\Medical Definition of AB (Entry 3 of 4)
: the one of the four ABO blood groups characterized by the presence of antigens designated by the letters A and B and by the absence of antibodies against these antigens
AB
abbreviationMedical Definition of AB (Entry 4 of 4)
1 aid to blind
2
[Latin artium baccalaureus] bachelor of arts
Comments on ab
What made you want to look up ab? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Great Scrabble Words—A Quiz
- Which of the following Q-without-U words means the number five in cards or dice?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Share ab
Time Traveler for ab
The first known use of ab was circa 1771
See more words from the same year