UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈfɔːmənt/US:USA pronunciation: respellingUSA pronunciation: respelling(fôrmənt)

WordReference Random House Unabridged Dictionary of American English © 2020
for•mant  (fôrmənt),USA pronunciation n. 
  1. Music and Dancethe range and number of partials present in a tone of a specific instrument, representing its timbre.
  2. Phonetics[Acoustic Phonet.]one of the regions of concentration of energy, prominent on a sound spectrogram, that collectively constitute the frequency spectrum of a speech sound. The relative positioning of the first and second formants, whether periodic or aperiodic, as of the o of hope at approximately 500 and 900 cycles per second, is usually sufficient to distinguish a sound from all others.
  • Latin formant- (stem of formāns), present participle of formāre to form; see -ant
  • 1900–05

Collins Concise English Dictionary © HarperCollins Publishers::
formant /ˈfɔːmənt/ n
  1. any of several frequency ranges within which the partials of a sound, esp a vowel sound, are at their strongest, thus imparting to the sound its own special quality, tone colour, or timbre
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