Which term pertains to the ear or the sense of hearing?

The term that specifically pertains to the ear or the sense of hearing is "aural." This word is derived from the Latin word "auris," which means ear. It is commonly used in contexts related to hearing and the auditory system, making it directly associated with the sense of hearing.

While "auditory" also relates to the sense of hearing, it focuses more on the processes and mechanisms of hearing rather than the specific association with the ear itself. Similarly, "acoustic" pertains to sound and may refer to the study of sound or properties related to sound but does not specifically denote the ear or hearing. The term "visual," on the other hand, relates to sight and has no connection to the sense of hearing.

Thus, "aural" is the most appropriate term for describing anything related to the ear and the sense of hearing.