1Excitement, arousal, or stimulation — an elevated emotional or physiological state (can be emotional excitement, nervous arousal, or physiological stimulation).
試合でファンが興奮して大声を上げた。
Fans got excited at the match and shouted loudly.
カフェインは中枢神経を興奮させる作用がある。
Caffeine has a stimulating effect on the central nervous system.
大事な発表の前で興奮して眠れなかった。
I was too excited before the important announcement to sleep.