AA- Alcoholic's Anonymous - a group that helps people recover from alcohol abuse 
My boss has been going to AA meetings for over a year.  
 
AD- Anno Domini - used to mark time that comes after the commonly accepted beginning of the Christian era 
The ancient city was founded in 125 AD.  
 
AGM- Annual General Meeting - the annual meeting of an organization 
My sister attended the AGM of the condominium owners last night.  
 
AI- Artificial Intelligence - used for robots etc 
Several professors at our university have been researching AI for many years now.  
 
AIDS- Acquired Immune Deficiency Syndrome - a disease of the immune system 
Recently the number of AIDS patients has been increasing rapidly in many countries.  
 
AM- Amplitude Modulation - a type of radio frequency 
We don't listen to AM radio much because we don't like the songs that they play.  
 
AOB- Any Other Business - used in meetings etc 
The organizer of the meeting wrote AOB at the bottom of the meeting information sheet.  
 
AOK- great, doing well 
He said that he was feeling AOK even after the truck had hit him.  
 
APB- All Point's Bulletin - used by the police when looking for a criminal 
The police put out an APB on the men who had robbed the bank.  
 
ASAP- As Soon As Possible 
Please finish the first draft of the letter and give it to me ASAP.  
 
AWOL- Absent Without Leave - often used in the military 
The military police were searching the area for the soldier who had gone AWOL.  
 
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