Definitions
1.NounA rapid alternation between an indicated note and the one above it as an ornament; 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⟩, /r/.
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"
6.VerbTo trickle.
7.VerbTo twirl.
8.AdjectiveTrue; respected.