The Collaborative International Dictionary of English v.0.48:

Piedmont \Pied"mont\, a. [F. pied foot + mont mountain.] (Geol.)
   Noting the region of foothills near the base of a mountain
   chain.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Piedmont
    n 1: the plateau between the coastal plain and the Appalachian
         Mountains: parts of Virginia and North and South Carolina
         and Georgia and Alabama
    2: a gentle slope leading from the base of a mountain to a
       region of flat land
    3: the region of northwestern Italy; includes the Po valley
       [syn: Piedmont, Piemonte]