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
