Leaving the concert, I felt completely elated by the incredible performance.

elated 是形容词，由动词 elate（使兴奋、使欢欣鼓舞）加上后缀 -ed 构成。elate 来自拉丁语 elatus（高举的、兴奋的），表示"极度兴奋、欣喜若狂"的状态。在句中形容人因精彩表演而达到极度愉悦的精神状态。