Noun keystone state has 1 sense
  1. Pennsylvania, Keystone State, PA - a Mid-Atlantic state; one of the original 13 colonies
    --1 is a kind of American state
    --1 is a part of Mid-Atlantic states
    --1 has parts:
     University of Pennsylvania, Pennsylvania, Penn; Allentown; Altoona; Bethlehem; Erie; Gettysburg; Harrisburg, capital of Pennsylvania; Chester; Philadelphia, City of Brotherly Love; Pittsburgh; Allegheny, Allegheny River; Lehigh River; Monongahela, Monongahela River; Susquehanna, Susquehanna River
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