Eigentümer

Noun

 * 1) the one who in general has the right to do as he will with a corporeal object and exclude others from it

Usage notes
Common translations of the term are owner and proprietor, however it is important to note that the restricted usage does not allow for it to be used with the same objects as these terms are in English and equivalent usage is barely idiomatic even colloquially: A — as distinguished from its “stamp” meaning – can only have an, and the compound  occurs in business administration but is inacceptable in legal parlance.