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When we all talk to each other, have conversations or engage with a language in any way, how do we know that the content (meaning) of our words is the same as the person we're talking to?
It's like Wittgensteins [sic] beetle in a box thing only for EVERYTHING! Like the words and sentences we use are consistent with the language framework we're using (eg. English) BUT, since these words can only be defined in terms of other words, we can never know what anyone is saying even if we ask them to carefully explain it. No?
Well Sam, The simple answer to your question is that we don't know that the other person knows what we're talking about. You're going to want to look at W.V.O. Quine's idea of the inscrutability of reference. The idea here is that when we hear someone speak, there is always a bunch of different ways to interpret whatever they say. Let's say you're a bro out hunting with some indigenous tribe you discovered like a boss, and one of the hunters points to a rabbit and goes, "Gabaga." Now maybe you take out your notebook and you write down, "Gabaga = rabbit. BOOM." And maybe you're fucking wrong and shouldn't assume shit. Maybe it means "rabbit feet" or "small white thing" or "potential food" - you'd have to spend a lot more time with them to eliminate those possibilities. But even once you were sure he was referring to the thing that you call a rabbit, and not some part of it or a general description or whatever, the problem still hasn't gone away. Maybe this culture has a religion that, among other things, teaches that everything is part of the same, unified life-force. So where you see rabbit, hunter-bro sees life-force part that looks like a rabbit. And to understand that, you would have to not only know enough language to eliminate the other options, you'd also need a pretty good grasp on the culture of this tribe, so that you'd know they don't really ever refer to individual things so much as distinguishable parts of this life-force situation.
And honestly, if it works for some language you learn later on in life by studying some random tribe, this idea also probably works for the language you learn early on in life by studying the tribe around you. Your roommate that you just met this week from the other side of the country from you? Maybe he's thinking something completely different from you when he's like, "so, we getting hammered this weekend?" You think, "Hammered = really, really drunk" but he thinks, "hammered = having reduced control of faculties as a result of alcohol in particular".