[di.a.pa.son] n [ME, fr. L, fr. Gk (he) dia pason (chordon symphonia), lit., the concord through all the notes, fr. dia through + pason, gen. fem. pl. of pas all--more at dia-, pan-] (ca. 1501) 1 a: a burst of sound "~s of laughter" b: the principal foundation stop in the organ extending through the complete range of the instrument c (1): the entire compass of musical tones (2): range, scope
2. a: tuning fork b: a standard of pitch