To me it sounds like you're making mountains out of molehills. Language is about communication, yes, but words and meanings have never been set in stone. Every year the dictionaries of the world update the meanings of words and phrases as languages change and evolve. A dictionary definition could be correct one year and then incorrect the next year. And despite all this, communication has not been rendered "impaired, sometimes made impossible". The solution to your problem is dirt-simple; if you don't understand what a word means, ask for clarification. A sentence to ask the question, a sentence to write a response, and then communication is restored. It's kind of like how you got clarification when you mixed up your German words. It's really not the big deal you're making it out to be.
A misunderstanding between two people does not make communication impossible, it just makes the conversation take longer while the two people work out the best way to communicate. Once that has been established, communication from thereon becomes more straightforward. For example, over the course of this thread, I realised labeling myself "zoomorphic" was a mistake because it didn't communicate anything of value and instead actively confused people. So now I don't use it anymore; I just say "core-identity furry" because the conversation thus far has heavily focused on the nature of furry as a core identity and there is a general understanding of what that means. And voila! There we have a basic example of language changing to render more useful meanings and make communication easier.
So let me now ask you a question: If you create a definition of furry that does not communicate anything of value to half the people who consider themselves furry, have you now made communication easier or harder for furry fandom?
To me it sounds like you're making mountains out of molehills. Language is about communication, yes, but words and meanings have never been set in stone. Every year the dictionaries of the world update the meanings of words and phrases as languages change and evolve. A dictionary definition could be correct one year and then incorrect the next year. And despite all this, communication has not been rendered "impaired, sometimes made impossible". The solution to your problem is dirt-simple; if you don't understand what a word means, ask for clarification. A sentence to ask the question, a sentence to write a response, and then communication is restored. It's kind of like how you got clarification when you mixed up your German words. It's really not the big deal you're making it out to be.
A misunderstanding between two people does not make communication impossible, it just makes the conversation take longer while the two people work out the best way to communicate. Once that has been established, communication from thereon becomes more straightforward. For example, over the course of this thread, I realised labeling myself "zoomorphic" was a mistake because it didn't communicate anything of value and instead actively confused people. So now I don't use it anymore; I just say "core-identity furry" because the conversation thus far has heavily focused on the nature of furry as a core identity and there is a general understanding of what that means. And voila! There we have a basic example of language changing to render more useful meanings and make communication easier.
So let me now ask you a question: If you create a definition of furry that does not communicate anything of value to half the people who consider themselves furry, have you now made communication easier or harder for furry fandom?