Etymology
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AIDS (n.)

1982, acronym formed from acquired immune deficiency syndrome. AIDS cocktail attested by 1997, the thing itself said to have been in use from 1995.

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Definitions of AIDS

aids (n.)
a serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles;
Synonyms: acquired immune deficiency syndrome
From wordnet.princeton.edu