firmagium

1 firmagium, ~ia [cf. 1 firmare 1] , foundation, embankment. a1200 ad ~iam stagni ejusdem molendini Cart. Fount. I 354; ~ium unius pontis tribus perticatis Ib. II 708.

2 firmagium [cf. 2 firma, Fr. fermage] , farm, fixed payment, rent. c1170 the ferm (~ium) of a certain fishery Cart. Fount. I 253; 1170 monachi ‥ sint quieti de theloneo et portagio et paasagio et pedagio et pasnagio et ~io (Ch. Ric. I) Hist. Harcourt IV 1281.