ab

noun4

1. •
   (US) The early stages of; the beginning process; the start.
2. •
   (informal) Clipping of abdominal muscle .

   • When possible, do your ab workout on a day when you're not training a major muscle group […] . — 2010
3. •
   Abbreviation of abortion.
4. •
   (slang) An abscess caused by injecting an illegal drug, usually heroin.

verb2

1. •
   (informal) To abseil.

   • I had a climbing rope in my pack, set up an abseil with it, and abbed down to him. — 1998
2. •
   Abbreviation of abort.

adverb1

1. •
   Abbreviation of about.

preposition1

1. •
   Abbreviation of about.

noun2

1. •
   Abbreviation of antibody.
2. •
   Abbreviation of abridgement.

preposition1

1. •
   Abbreviation of about.

noun15

1. •
   A blood type of the ABO system that has both blood antigens and may receive all blood types, and donate to AB.
2. •
   A person with this blood type.
3. •
   Abbreviation of Alberta: a province of Canada.
4. •
   Initialism of antibody.
5. •
   Initialism of assembly bill.

   • AB-89 would have required that participation in sex-segregated California school programs, athletic teams, and facility use be based on a pupil’s sex, not gender identity. — 2025
6. •
   Initialism of able seaman or able-bodied seaman.
7. •
   (Australia) A halal snack pack consisting of doner meat topped with chips, tomato sauce, chilli sauce, barbecue sauce, and garlic sauce.
8. •
   Initialism of airbase.
9. •
   Initialism of adult baby.

   • Well, he appears to be an AB. You know, an adult baby. It's a fetish in which the baby is taken care of in every way by a mommy or a daddy. — 2002
10. •
    Initialism of afterburner.
11. •
    Initialism of asymmetric bars.
12. •
    Initialism of artificial breeding.
13. •
    Abbreviation of alkylbenzene.
14. •
    Initialism of aid to the blind.
15. •
    Initialism of attentional blink.

adjective3

1. •
   Initialism of at bat.
2. •
   Initialism of airborne.
3. •
   Initialism of antiballistic.

noun4

1. •
   Symbol for antibody.
2. •
   (old-fashioned) 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.
3. •
   (old-fashioned) An Ancient Egyptian amulet in the shape of a heart (ib).
4. •
   Abbreviation of Abbot.