Which term refers to the study of sound or hearing?

The term that refers to the study of sound or hearing is "acoustic." Acoustics encompasses the science of sound, including its production, transmission, and effects. This field plays a crucial role in various applications, such as audio engineering, architectural design, and environmental noise control, indicating its significance in both scientific and practical contexts. Understanding acoustics is vital for professionals in fields that deal with sound, helping them create environments that enhance audio quality or analyzing sound patterns and behaviors.

The other terms presented do not relate to sound or hearing. Acrimony refers to bitterness or ill feeling, ademption involves the revocation of a gift or a legacy, and an affidavit is a written statement confirmed by oath, used as evidence in legal proceedings. None of these terms align with the study of sound.