激 (jī) means 'to stir, to excite, or to agitate', while 动 (dòng) means 'to move' — together, 激动 literally conveys the idea of being 'stirred up' or 'emotionally moved'. It describes a strong, often positive emotional state: excitement, exhilaration, or deep emotional arousal — such as when receiving good news, witnessing something inspiring, or reuniting with a loved one. Unlike neutral words like 高兴 (gāoxìng, 'happy'), 激动 carries intensity and physical manifestation — trembling hands, tears, rapid heartbeat — and is commonly used in both spoken and written Chinese.

This word functions flexibly as both an adjective ('I am excited') and a verb ('He got excited'). It’s frequently modified by degree adverbs like 非常 (fēicháng), 十分 (shífēn), or 有点儿 (yǒudiǎnr), and often appears after subject + 是…的 constructions for emphasis. While it usually expresses positive excitement, context can shift its nuance — for example, 激动地喊叫 may imply uncontrolled emotion, not necessarily joy.