Excitement
Stimulation
noun, verbal noun
My interest is stirred up! I'm feeling excitement and stimulation from all this stirring up, in fact!
The reading for 興奮 is one you didn't learn with the kanji, though it's similar. Instead of きょう it's こう, so just think of how whenever you feel excitement, it's thanks to こういち. So just think of こういち exciting you in some way to remember this vocab's reading.
止まれの標識を無視する度に、興奮するんです。
Every time I ignore a stop sign I get excited.