An adverb used to introduce a hypothetical or concessive clause; often paired with ても／でも／とも to mean 'even if' or 'no matter (what)'.
たとえ雨が降っても行きます。
I'll go even if it rains.
たとえ反対されても続けるつもりだ。
I intend to continue even if I'm opposed.
たとえ高くても、あの時計を買いたい。
Even if it's expensive, I want to buy that watch.