comes from the same root word as "kidnap". Whether you take someone's work intentionally or unintentionally and claim it as your own, you are plagiarizing.
is removing personal property, thereby depriving the rightful owner of it. Whether it is intentional or unintentional, it is theft.
Copyright Laws encourages your creativity becuase your own work is copyrighted and no one else can legally take it.
Plagiarism is to commit literary theft!