Definition of "GOP"

GOP¹

/ˌdʒi oʊ ˈpi/

proper noun
1. (US politics) The Republican Party, one of the two major political parties in the United States.
  Quotations
  On their behalf, Reagan insisted (over the objections of the Ford forces) that the GOP platform declare that henceforth “the goal of Republican foreign policy is the achievement of liberty under law and a just and lasting peace in the world.”
  2005, Jesse Helms, “Ronald Reagan, 1976”, in Here's Where I Stand: A Memoir‎, New York: Random House, page 103

GOP²

noun
plural GOPs
1. (signal processing, video compression) Acronym of group of pictures.