(Part-1)
1) AA: Anti-Aircraft or
Author's Alterations
2) AAAS: American Association of Advancement of Science
3) AAEI: Automobile Association of Eastern India
4) AAFI: Amateur Athletics Federation of India
5) AAG: Afro-Asian Games
6) AAI: Airport Authority of India
7) AAOU: Asian Association for Open University
8) AAPI: American Association of Physicians of Indian Origin
9) AAPSO: Afro-Asian Peoples Solidarity Organization
10) AASU: All-Assam Students' Union
11) ABC: Audit Bureau of Circulations or
American Broadcasting Company or
Australian Broadcasting Company
12) ABM: Anti-Ballistic Missiles
13) ABSU: All Bodo Students' Union
14) ABU: Asian Broadcasting Union
15) AC: Alternating Current or
Ashok Chakra or
Ante Christum (Before Christ)
16) ACAS: Airborne Collision Avoidance System
17) ACC: Auxiliary Cadet Corps or
Air Coordinating Commitee
18) ACD: Asian Co-operation Dialogue
19) ACL: Access Control List
20) ACU: Asian Clearing Union
21) AD: Anno Domini (After Christ)
22) ADB: Asian Development Bank
23) ADBS: Advanced Data Broadcast System
24) ADC: Aide-de-Camp
25) ADDA: Assansol Durgapur Development Authority
