What does it mean to learn a language?

What does it mean when you say you want to learn a language? What do you expect to be true before you have learned a language? And what is happening when you are learning a language? That phrase is pretty powerful, and yet pretty vague. Apparently, everyone understands it differently.
A little controversy
A few weeks ago, I made the bold statement that I had learned Polish in just 8 days. I admit that I chose these words because they would be a bit controversial, but they were not untrue.

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