A quivering or trembling caused by sudden excitement or emotion: "She so excited that she was unable to explain the thrill she got from seeing and talking with her favorite actor this evening."

To cause someone to feel very excited or happy: "Circus performers still thrill audiences today."

A high-pitched warbling sound, especially one made by a bird: "You could hear the trill sounds being made by the birds in the pet shop."

To make a consonant sound by two vocal organs vibrating rapidly against each other; for example, the tip of the tongue vibrating against the ridge behind the front teeth: "You can hear him trill his r's when he speaks."