Etymology
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trill (n.)

1640s, from Italian trillio, triglio "a quavering or warbling in singing," probably ultimately of imitative origin. The verb is 1660s, from Italian trillare "to quaver, trill." Related: Trilled; trilling.

updated on February 16, 2014

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Definitions of trill from WordNet
1
trill (v.)
pronounce with a trill, of the phoneme `r';
Some speakers trill their r's
trill (v.)
sing or play with trills, alternating with the half note above or below;
Synonyms: warble / quaver
2
trill (n.)
a note that alternates rapidly with another note a semitone above it;
Synonyms: shake
trill (n.)
the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula;
he pronounced his R's with a distinct trill
From wordnet.princeton.edu, not affiliated with etymonline.