A more thorough explanation:

Definition: Allodium (pronounced uh-loh-dee-uhm) is a type of estate in which the owner has complete ownership of the land, free from any feudal services or obligations.

Example: If John owns a piece of land as an allodium, he has full control over it and is not required to pay any rent or taxes to a feudal lord.

This means that the owner of an allodium has the right to use the land as they see fit, without any interference from a higher authority. This type of ownership is common in the United States, where land is often held in fee simple absolute.