What does allodium mean?
The definition of allodium
Al*lo”di*um, n.
Etym: [LL. allodium, alodium, alodis, alaudis, of Ger. origin; cf. OHG. al all, and (AS. ead) possession, property. It means, therefore, entirely one’s property.] (Law)

Freehold estate; land which is the absolute property of the owner; real estate held in absolute independence, without being subject to any rent, service, or acknowledgment to a superior. It is thus opposed to feud. Blackstone. Bouvier.