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 Original Agreement Effective Date and end on the first to occur ofMarch 31, June 30, September 30 or December 31 thereafter and the last CalendarQuarter of the Term shall end on the last day of the Term and ( b ) the first CalendarQuarter of a Royalty Term for a Global AT3 Licensed Product in a country shall begin onthe First Commercial Sale of a Global AT3 Licensed Product in such country and end onthe first to occur of March 31, June 30, September 30 or December 31 thereafter and thelast Calendar Quarter of a Royalty Term shall end on the last day of such Royalty Term