- Also: a.b.
able-bodied seaman (in the US) Bachelor of Arts (esp in postal addresses) Alberta (Canada)
a human blood type of the ABO group, containing both the A antigen and the B antigen
WordReference Random House Learner's Dictionary of American English © 2025
AB /ˈeɪˈbi/USA pronunciation
Symbol.
ab-,
A.B., an abbreviation of:
WordReference Random House Unabridged Dictionary of American English © 2025- Physiologya major blood group.
ab-,
- prefix. ab- is used before some words and roots to mean "off, away'': abnormal (= away from what is normal).Compare
a-2.
A.B., an abbreviation of:
- Education, Bachelor of Arts.
AB, +
- AbbreviationsAlberta, Canada (approved for postal use).
Collins Concise English Dictionary © HarperCollins Publishers::
Ab
(äb, äv),USA pronunciation n.
AB,
Ab, Symbol.
ab-,
ab.,
- JudaismAv.
AB,
- Nautical, Naval TermsSee able seaman.
- Militaryairborne.
- Military[U.S. Air Force.]Airman Basic.
- AbbreviationsAlberta, Canada (approved for postal use).
- Militaryantiballistic;
antiballistic missile.
- Physiologya 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. Cf. ABO system.
Ab, Symbol.
- Chemistryalabamine.
- Immunologyantibody.
ab-,
- a formal element occurring in loanwords from Latin, where it meant "away from'':abdicate; abolition.
- Latin ab (preposition and prefix) from, away, cognate with Greek apó, Sanskrit ápa, German ab, English of1, off
ab.,
- about.
- Sport[Baseball.](times) at bat.
- Nautical, Naval TermsSee able seaman.
- See Bachelor of Arts.
- Neo-Latin, Medieval Latin Artium Baccalaureus
- Sport[Baseball.](times) at bat.
- Sport(times) at bat.
Collins Concise English Dictionary © HarperCollins Publishers::
away from; off; outside of; opposite to: abnormal, abaxial, aboral
denoting a cgs unit of measurement in the electromagnetic system: abvolt
'AB' also found in these entries (note: many are not synonyms or translations):
A, a
- ABO system
- Abbe condenser
- Abbe number
- Abbey Theatre
- Abdul-Mejid I
- Aberdeen Angus
- Aberdeen Proving Ground
- Aberdeen terrier
- Abhidhamma Pitaka
- Abney level
- Alberta
- ab aeterno
- ab esse
- ab extra
- ab initio
- ab intra
- ab-
- abampere
- abaxial
- abb
- abbess
- abbot
- abbreviate
- abcoulomb
- abdicate
- abduce
- aberrant
- aberration
- abfarad
- abhenry
- abhominable
- abhor
- abient
- abietic acid
- abirritant
- abirritate
- abject
- abjection
- abjunction
- abjure
- ablactate
- ablate
- ablative absolute
- ablaut
- able seaman
- able-bodied seaman
- abluent
- abmho
- abmodality