definiens: Co - PromOljon Year " ! hall mean, for 11 K Calendar Year in which the Parties are firsl en.:aged in Co - Promotion, the ponion of lhe Calendar Year rcmainina beginning upon lhe dale of the firs ! commercial sale in the United Stules followinll the commencement of Ih~ Co - Promotion Agreeme nt, and shall thereafter mean lhe relevlnt Calendar Year . or pro rata ponion thereof, unlil thc cxpiration or earlier Icnnination of ACAOIA 's ri!;llllO Co - l > romOic the Product as provided herein, shall man tiM : detail aid . prt : mium IIDd leave behinds . and such olher Promolional Matcrials thai lhe Parties agree arc a cort : requirement for Detailinll the Product