definiens: means ( a ) with respect to t he first Contract Year, the period beginning on the Effective Date and ending on December 31, 2004 ( the ), and ( b ) with respect to ea ch subsequent Contract Year, the twelve ( 12 ) month per iod beginning on the day following the end of the F irst Contract Year and each succeeding twelve ( 12 ) month period thereafter during the term of the Agreement ( except that the last Contract Year shall end on the effect i ve date of any termination or expiration of this A greement ) . Each Contract Year ( other than the First and last Contra ct Year ) shall be divided into four ( 4 ) comprised of successive three ( 3 ) month periods . In the First Contract Year, the first Contract Quarte r shall begin on the Effective Date and end on March 31, 2004, an d in the last Contract Year, the last Contract Quar ter shall end on the effective date of any termination or expirat ion of this Agreement