The term comes from the late-Latin word missa ( dismissal ) , a word used in the concluding formula of Mass in Latin : `` Ite , missa est '' ( `` Go , it is the dismissal '' ) . The term `` Mass '' is derived from the Late Latin word missa ( dismissal ) , a word used in the concluding formula of Mass in Latin : `` Ite , missa est '' ( `` Go ; it is the dismissal '' ) .