>>865
https://doc.rust-lang.org/book/ch04-01-what-is-ownership.html

Ownership Rules
First, let’s take a look at the ownership rules. Keep these rules in mind as we work through the examples that illustrate them:

・Each value in Rust has an owner.
・There can only be one owner at a time.
・When the owner goes out of scope, the value will be dropped.

「所有権」はownershipの訳語だから、このルールにおける「ownerであること」がownershipの定義と言っていいんじゃない？