Definition of "binaural" [bin•au•ral]

• Having or relating to two ears. (adjective)
• Having to do with the perception of sound with both ears: binaural hearing. (adjective)
• Of or relating to sound transmission from two sources, which may vary acoustically, as in tone or pitch, to give a stereophonic effect. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "They use a fancy thing called a binaural beat, combined with a hypnotherapy track, to help pull you into the depth of a good nap."
• "And you could listen in headphones with this thing called binaural recording."
• "The humans cannot hear sound low enough to be useful for brain stimulation, so we've used a technique called binaural beats."