definiens: Co - Promotion Term " means the period commencing with the 2003 - 2004 Flu Season, and terminating upon the earlier of ( a ) the · conclusion of the eleventh Flu Season ( i.e., May I, 2014 ), or ( b ) termination of this Agreement pursuant to Section 19.2, 19.3, 19.4 or 19.5, or as otherwise agreed by the Parties in writing . " For clarity, under the terms of this amended Section 1.16, the tenn of the U.S. Agreement will expire upon the completion of the eleventh Flu Season, unless terminated earlier in accordance with the tenos of the U.S. Agreement ( as amended by this Master Amendment ) . Since the first Flu Season is 2003 - 2004, the U.S. Agreement will expire ( unless terminated ) upon the conclusion of the 2013 - 2014 Flu Season