Meaning of AA in English
(ALCOHOL) [noun] [U + singular or plural verb; not after the] - abbreviation for Alcoholics Anonymous (= an organization for people who drink too much alcohol and who want to cure themselves of this habit)AA help/helps thousands of people a year to stop drinking.The doctor advised him to go to AA meetings where he could talk to other people who were also trying to stop drinking.
Cambridge English vocab. Кембриджский английский словарь. 2012