#1 aide n. an officer who acts as military assistant to a more senior officer. wn
#2 aide n. someone who acts as assistant. wn
#3 A.D. r. in the Christian era; used before dates after the supposed year Christ was born; "in AD 200". wn
#4 AIDS n. a serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles. wn
#5 ARDA n. an agency of the Intelligence Community that conducts advanced research and development related to information technology. wn
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