Audible means loud enough to be heard. Barely audible, an audible gasp, audible from the road.
It is a threshold word: something is audible or it is not, which is why barely audible is such a useful phrase. In American football, an audible is a play changed aloud at the line, and call an audible has become general business language for changing plan on the spot. Note inaudible; and that audible and audio come from the Latin for hearing.
1adjectiveaudibleLoud enough to be heard.
“The music from next door was audible through the walls until midnight.”
audible is a quality of being heard.
Latin audibilis comes from audire, to hear. Audio, audience, audit and obey come from the same hearing.
Proto-Indo-European
*h₂ew-
Latin
audibilis
Middle French
audible
English, today
audible
Middle French audible, from Latin audibilis, from Latin audire (“to hear”).
Etymology from Wiktionary, CC BY-SA