Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Informal Silly; crazy.
  • adj. Informal Completely absorbed, infatuated, or excited: They were gaga over the rock group's new album.
  • adj. Informal Senile; doddering.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Senile.
  • adj. Crazy.
  • adj. Infatuated.

from the GNU version of the Collaborative International Dictionary of English

  • adj. mentally or physically infirm with age.
  • adj. marked by foolish or unreasoning fondness.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. mentally or physically infirm with age
  • adj. intensely enthusiastic about or preoccupied with

Etymologies

French, old fool, gaga, of imitative origin.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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