apparterenza
Apparterenza is not a standard term in Italian. It is not listed in major dictionaries and has no widely recognized definition. In published texts it occurs only sporadically and is generally treated as a nonstandard form, a typographical error, or a nonce coinage whose intended meaning depends on context. Because it lacks an established meaning, lexical authorities do not provide a definitive sense for the word.
In practice, encountering apparterenza often suggests one of two likely intentions. It may be a misspelling
Etymologically, there is no agreed derivation for apparterenza because the form is not established in the language.