Frommega- +‎gift.

megagift (pluralmegagifts)

1. (neologism) Adonation tocharity ofmillions of dollars.
   • 2007 June 25, Stephanie Strom, “Absence of Major Disaster in ’06 Affected Giving”, inNew York Times‎^[1]:

     “Thesemegagifts are beginning to show up in a way they haven’t before,” Mr. Jolly said.

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