This is the important question. After reading Ted Chiang's story "Understand" about this question, a simple working definition could be that to understand somet

This is the important question. After reading Ted Chiang's story "Understand" about this question, a simple working definition could be that to understand something you apprehend the domain of the subject from its substrate. Hence Feynman's "what I cannot create I do not understand," as well. In this sense, an AI could be said to Understand language if it used it as one of a selection of tools to operate on itself, a peer or other being, or its environment.