Definition of "trill"

trill¹

/tɹɪl/

noun
plural trills
1. (music) A 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. (phonetics) A type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish ⟨rr⟩, /r/.
3. A tremulous high-pitched vocal sound produced by cats.
verb
third-person singular simple present trills, present participle trilling, simple past and past participle trilled
1. (intransitive) To 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.
  Quotations
  To judge of trilling notes and tripping feet.
  1692, John Dryden, Cleomenes, the Spartan Hero, a Tragedy
2. (transitive) To impart the quality of a trill to; to utter as, or with, a trill.
  Quotations
  The sober-suited songstress trills her lay.
  1727, James Thomson, “Summer”, in The Seasons, London: […] A[ndrew] Millar, and sold by Thomas Cadell, […], published 1768

trill²

verb
third-person singular simple present trills, present participle trilling, simple past and past participle trilled
1. (intransitive, obsolete) To trickle.
  Quotations
  I come now from seeing of a shepheard at Medoc […] who had no signe at all of genitorie parts: But where they should be, are three little holes, by which his water doth continually tril from him.
  1603, Michel de Montaigne, chapter 30, in John Florio, transl., The Essayes […], book II, London: […] Val[entine] Simmes for Edward Blount […]
  And now and then an ample tear trilled down / Her delicate cheek.
  c. 1603–1606, William Shakespeare, “The Tragedie of King Lear”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene iii]
  Whisper'd sounds / Of waters, trilling from the riven stone.
  1737, Richard Glover, Leonidas Book

trill³

verb
third-person singular simple present trills, present participle trilling, simple past and past participle trilled
1. (intransitive, obsolete) To twirl.

trill⁴

adjective
comparative triller, superlative trillest
1. (slang, hip-hop culture) True, respected.
  Quotations
  All my trill niggas know who be bringin da funk / Lees and shell toes like it's Black History Month
  2007, “Black History Month”, in The Inevitable Rise and Liberation of NiggyTardust!, performed by Saul Williams
  LAMAR: Oh, really? That's a nice change from fools comin' up on us. / FRANKLIN: That's trill, homie. / LAMAR: You damn straight that's trill, partner, but it's a shame I don't believe it. You wanna drop some notes on that shit, I'll give you the odds, homie.
  2013, Grand Theft Auto V, Rockstar Games, level/area: Repossession
  Middle finger to the critics, me and my nigga Skrillex / You know we finna kill it, A$AP we the trillest
  2013, “Wild for the Night”, performed by A$AP Rocky