Definition of trill
1 a
:the alternation of two musical tones a diatonic second apart — called also
shake
b
:vibrato
c
:a rapid reiteration of the same tone especially on a percussion instrument
2
:a sound resembling a musical trill :warble
3 a
:the rapid vibration of one speech organ against another (as of the tip of the tongue against the teethridge)
b
:a speech sound made by a trill
