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Sound that can be heard.

Audio frequency

Streaming media over the Internet.

Windows Media Audio, Microsoft's proprietary digital audio format.

Broadcasting or reception of sound.

Sound recording and reproduction.

Audio book, a sound recording of a book.

"I hear" in Latin.

Audio, magazine covering high fidelity music reproduction.

Audio, the debut album of the Blue Man Group.

Audible.com, an online audiobook store.

In American football, "calling an audible" is a quarterback changing a play at the line of scrimage without calling a timeout.