What term refers to feeling triumphant or rejoicing?

The term that refers to feeling triumphant or rejoicing is "exult." This word specifically conveys a sense of great joy or elation, often as a result of a success or victory. In contrast to the other options, "exult" embodies a celebratory spirit and an overwhelming sense of happiness that arises from achievement or good fortune.

"Commiserate" relates to expressing sorrow or sympathy for someone else's misfortune, which is the opposite of feeling triumphant. "Celebrate" does describe rejoicing, but it has a broader meaning about holding an event or gathering to acknowledge a victory rather than the internal feeling of joy itself. "Despair" reflects a state of hopelessness or sadness, which is contrary to triumph or joy. Therefore, "exult" stands out as the most precise term for the feeling of triumph and joy following a success.