althoughという意味で使うwhenとは？

the fact that the word with example sentence had been in the dictionary would tell us that it's not exception. we'd use new word following the usage of example sentences in the dictionary. please not to dislike it before you try to use it. through using it I suppose you might find new feeling of using new words. I appreciate you'd extend your vocabulary using new words.

:'when' in weblio dictionary.
https://ejje.weblio.jp/content/when