adv. [f. prec. + -LY2.] In an acoustic manner; in relation to the hearing or appreciation of sounds.
1874. Tyndall, in Contemp. Rev., 826. The day was acoustically clear; at a distance of 10 miles the horn yielded a plain sound.
1880. H. Sweet, in Academy, 3 April, 254. Many phoneticians still confuse them acoustically.
