audio-, aud-, audi-, audit- +

(Latin: hearing, listening, perception of sounds)

Audi alteram partem.
Hear the other side.

Also, "There are two sides to every question"; a plea for reason and fairness in discussions.

audibility
Quality, fact, or degree of being audible or perceptible by the ear.
audible
1. Loud or clear enough to be heard.
2. Capable of being heard; loud enough to be heard; actually heard.

Nature has given us two ears, two eyes and just one tongue, to the end that we should hear and see more than we speak.

—Socrates

Profanity makes ignorance audible.

—Anonymous
audibleness
The quality, fact, or degree of being audible or perceptible by the ear.
audibly
In an audible manner; characterized by being heard or being capable of hearing.
audiclave
A former term for a "hearing aid".
audicon
A name used by various businesses dealing with listening to music, or other forms of entertainment using sounds.
audience
1. A group of spectators at a public event; listeners or viewers collectively, as in attendance at a theater or concert.
2. The readership for printed matter, as for a book.
3. A body of adherents; a following. 4. A formal hearing, as with a religious or state dignitary.
5. An opportunity to be heard or to express one's views.
6. The act of hearing or attending to words or sounds.
7. An opportunity to be heard; chance to speak to or before a person or a group; a hearing or listening to.
8. A formal interview with a sovereign, high officer of government, or other high-ranking person: "She enjoyed having an audience with the pope."
audiency
Characterized by listening and hearing.
audient
Listening and hearing.

We have two ears and only one tongue so that we may hear more and speak less.

—Diogenes; ancient Greek philosopher and Cynic, circa 400-325 B.C.
audile
An individual having a tendency to form mental images derived from auditory sensations.
audio
1. The recording and reproduction of sound.
2. The part of television or movie equipment that has to do with sound; as opposed to the visual portion (video).
3. The broadcasting, reception, or reproduction of sound.
4. A sound signal: "We lost the audio during the radio broadcast."
audio component
The part of any wave or signal whose frequencies are within the audible range.
audio device
Any of a wide variety of computer components that accept or produce sound.
audio frequency range, audio range
The portion of the acoustic energy spectrum, from about 20 to 20,000 vibrations per second, that can be detected by a human with normal hearing.

Related "hear, hearing; listen, listening" units: acous-; ausculto-.