What does it mean to know a word, and how do we learn them?
Probably the main indicator of progress in language learning is increasing “known vocabulary”. While that sounds pretty uncontroversial* and simple, actually deciding what “knowing a word” is is actually a subject of hot debate! Particularly when we need to be very precise about things - exactly what you need when you create software - things start to get much less clear.
How do you know whether you know something? The answer to this question is one that has challenged philosophers and sages since time immemorial!
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