definiens: means the respective periods of three ( 3)consecutive calendar months ending on March 31, June 30, September 30 andDecember 31 of each Calendar Year, provided that ( a ) the first Calendar Quarter of theTerm shall begin on the Effective Date and end on the first to occur of March 31, June 30,September 30 or December 31 thereafter and the last Calendar Quarter of the Term shallend on the last day of the Term and ( b ) the first Calendar Quarter of a Royalty Term for aGlobal AT3 Licensed Product in a country shall begin on the First Commercial Sale of aGlobal AT3 Licensed Product in such country and end on the first to occur of March 31,June 30, September 30 or December 31 thereafter and the last Calendar Quarter of aRoyalty Term shall end on the last day of such Royalty Term