Can you help me understand the meaning of the word "andre" in this sentence:

"Yuhna møter de andre på ei kantine på Universitetet."

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質問を翻訳

The two meanings are related. If you're not "den første" (the first one), you are "den andre" (the second/other one). The second person is the other person -- the remaining person -- the one among two who is not the first, and thus by necessity also the second.

You are correct about "de", in that it tips us off about which sense of "andre" is appropriate in this context. In this case it's the plural (the translation is "others" rather than "other"), but if "den" was used instead and we were talking about the singular, we would only really know it was "other" rather than "second" by context. To me it seems right to assume the meaning of "other" if a specific one is necessary and nothing suggestions a different interpretation.