All 8 Uses

audible
in
Lord of the Flies
(Edited)

Now the antagonism was audible.
p. 51.8

audible = capable of being heard
The chant was audible but at that distance still wordless.
p. 68.8 *
Yet as the words became audible, the procession reached the steepest part of the mountain, and in a minute or two the chant had died away.
p. 69.1
Simon's mouth labored, brought forth audible words.
p. 143.4
Ralph took an uncertain step, pointed to a palm tree, and whispered something inaudible to Piggy; and they both giggled like Sam.
p. 149.4

inaudible = not capable of being heard

standard prefix: The prefix "in-" in inaudible means not and reverses the meaning of audible. This is the same pattern you see in words like invisible, incomplete, and insecure.
The line of phosphorescence bulged about the sand grains and little pebbles; it held them each in a dimple of tension, then suddenly accepted them with an inaudible syllable and moved on.
p. 153.9
Dark figures drew themselves out of the wreckage and flitted away, till the screams of the littluns and Piggy's gasps were once more audible.
p. 167.6

audible = capable of being heard
His first words were a gasp, but audible.
p. 175.3

Definitions:

(1) (audible as in: barely audible)
capable of being heard
(2) (meaning too rare to warrant focus)
In football, the term has come to include an instruction shouted from the line of scrimmage.

Recently, the word is also being used to indicate sounds that could be played on a phone or computer; for example "audibles include creative hellos that can be downloaded."