at the source code." It states that while the term "Free Software" can lead to two different interpretations, at least one of them is consistent with the intended meaning unlike the term "Open Source". The loan adjective "libre" is often used to avoid the ambiguity of the word "free" in the English language and the ambiguity of the older usage of "free software" as public-domain software. (See Gratis versus libre.)

Definition and the Four Essential Freedoms of Free Software