It forms all or part of: aesthete; aesthetic; anesthesia; audible; audience; audio; audio-; audit; audition; auditor; auditorium; auditory; hyperaesthesia; kinesthetic; oyer; oyez; obedient; obey; paraesthesia; synaesthesia.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit avih, Avestan avish "openly, evidently;" Greek aisthanesthai "to feel;" Latin audire "to hear;" Old Church Slavonic javiti "to reveal."
1590s, "power of hearing;" 1650s, "act of hearing, a listening," from French audicion "hearing (in a court of law)" and directly from Latin auditionem (nominative auditio) "a hearing, listening to," noun of action from past-participle stem of audire "to hear" (from PIE root *au- "to perceive"). Meaning "trial for a performer" first recorded 1881.
"part of a public building where people gather to hear speeches, etc.," 1727, from Latin auditorium "a lecture-room," literally "place where something is heard," in Medieval Latin especially "a reception room in a monastery," noun use of neuter of auditorius (adj.) "of or for hearing," from auditus, past participle of audire "to hear" (from PIE root *au- "to perceive"); also see -ory. Earlier in English in the same sense was auditory (late 14c.), and Latin auditorium was glossed in Old English by spræchus ("speech-house").