aa

abbreviation

Definition of aa

ana

1

AA

play
noun \ ˈdə-bəl-ˈā \

Definition of AA

plural AAs

First Known Use of aa

1937


2

AA

abbreviation

Definition of AA

1 administrative assistant
2 Alcoholics Anonymous
3 antiaircraft
4 associate in arts
5 author's alterations

Medical Dictionary

āā

abbreviation
variants: also aa

medical Definition of āā

of each used at the end of a list of two or more substances in a prescription to indicate that equal quantities of each are to be taken

Origin and Etymology of āā

Latin ana


AA

abbreviation

medical Definition of AA

2 Alcoholics Anonymous

Learn More about aa


Seen and Heard

What made you want to look up aa? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

agreeable, attractive, or delicious

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!