Definitions
1.nounA rapid alternation between an indicated note and the one above it, in musical notation usually indicated with the letters tr written above the staff.
2.nounA type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish rr.
3.nounA tremulous high-pitched vocal sound produced by cats.
4.verbTo create a trill sound; to utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver.
5.verbTo impart the quality of a trill to; to utter as, or with, a trill."to trill a note, or the letter r"