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Entry 2 senses Webster, 1913

gaga

· IPA /ˈɡɑːɡɑː/
01 adj. mentally or physically infirm with age.
  1. 1.
    mentally or physically infirm with age.
  2. 2.
    marked by foolish or unreasoning fondness; as, gaga over his girlfriend.
Syn. doddering, senile. — Syn. -- crazy about, dotty, enamored, infatuated, in love, smitten, soft on(predicate), taken with(predicate).