https://plato.stanford.edu/entries/linguistics/#ILanELan

There is already a body of research on this sort of topic. It’s worth noting that when you use the word “language”, you are actually talking about two distinct things at the same time, and are in danger of conflating them. “Language” (Singular) is the ability of a human to communicate — the definition is much deeper than that and includes things like the innate grasp of grammaticality and other things, but for this Reddit comment my definition suffices. “Languages” (Plural) are the manifestations of that ability, as codified within a (often arbitrarily) defined community, e.g. English, French, etc.

If one person