a. [f. L. ūni- UNI- + sonant-, sonans (see SONANT a.), after dissonant, etc. Cf. F. unissonant.] Of the same pitch or sound; unisonal, unisonous. Also in fig. context.
1801. Busby, Dict. Mus., Unisonus, or Unisonant, an epithet applied to those sounds which are … in unison with each other.
1834. Mrs. Somerville, Connex. Phys. Sci., xvii. (1836), 168. If two bottles be … tuned by filling them with such a quantity of water as will render them unisonant with two tuning-forks which differ in pitch.
1886. Linskill, Haven under Hill, ix. 115. The mystic, moving, unisonant harmony that was stirring and breaking upon her own soul.
