Among divines and philosophers, signifies the duties which a man lies under an obligation to perform: thus we meet with the agenda of a Christian, or the duties he ought to perform, in opposition to the credenda, or the things he is to believe. It is also applied to the service or office of the church, and to church books compiled by public authority, prescribing the order to be observed; and amounts to the same as ritual, formulary, directory, missal, &c.