Diapason (noun)
dai-a-pay-sun
A grand swelling burst of harmony.
(literary) The entire compass, range, or scope of something.
Late Middle English (denoting the interval of an octave): via Latin from Greek dia pasōn (khordōn) ‘through all (notes)’.
Example sentences
“As he spoke he allowed his voice to swell into a sonorous diapason.”
“As an author he understands the full human diapason.”