Audible means able to be heard. When something is audible, your ears can detect it. A whisper across a quiet library might be audible, but the same whisper in a noisy cafeteria probably wouldn't be.

Teachers often ask students to speak in an audible voice during presentations so everyone in the classroom can hear them clearly. During a thunderstorm, rain might be barely audible through closed windows, while thunder is clearly audible even from inside.

The opposite is inaudible, meaning too quiet or faint to hear. A dog whistle is inaudible to humans but audible to dogs because it produces sounds at frequencies our ears can't detect.

In football, an audible is also a noun: it's when the quarterback changes the play at the line of scrimmage by calling out new instructions to the team. The quarterback calls an audible when they see the defense lined up in an unexpected way and need to adjust the strategy on the spot.