wallagium Save DMLBS wallagium [walla+-agium], tax levied for the erection, maintenance, or repair of wall, embankment, or sim.. 1352 redditibus, serviciis, scottis, lottis, tallagiis, wallagiis et ‥ aliis oneribus ad ‥ tenementa ‥ accidentibus Reg. Rough 245.