h₂ews-dʰ-
“to hear, give ear to”audit, audience, obey, auditorium
Extended form giving Latin audīre, English audit, audience, obey, auditorium, obedient.
Discussion
The PIE form *h₂ews-dʰ- (to hear, to give ear to) combines the root *h₂ews- (ear, to perceive by ear) with the causative/intensive extension *-dʰ-. The formation implies active, directed hearing — not passive reception of sound but deliberate attention, the act of giving one's ear.
Latin audīre (to hear) is the central reflex, generating one of the most important word families in institutional English: audience (those who hear, an assembly of listeners), audit (a hearing, hence a formal examination — originally the accounts were read aloud and heard), auditorium (a place for hearing), audible (capable of being heard), and obey (from ob-audīre, to hear toward, to listen attentively to — obedience is, etymologically, good hearing).
The connection between hearing and obedience deserves emphasis. Latin ob-audīre (whence Old French obeir, whence English obey) makes explicit what many languages encode implicitly: to obey is to hear properly, to listen and respond. The German gehorsam (obedient, from hören, to hear) and the Sanskrit śuśrūṣā (obedience, from śru-, to hear) show the same conceptual link independently — evidence that PIE speakers associated attentive hearing with social compliance.
Greek aisthánomai (αἰσθάνομαι, "to perceive, to sense") is sometimes connected to this root, though the phonological derivation is debated. If the connection holds, it extends the semantic field from hearing to perception generally — a development that would make aesthetic (from aisthētikós, "pertaining to perception") a distant relative of audience and audit.
The Old English reflex is less transparent: OE ēare (ear) continues the base noun *h₂ews- (ear) without the *-dʰ- extension, and the verb hīeran/hȳran (to hear) may derive from a different formation of the same root. Gothic hausjan (to hear) preserves the Germanic verb form.
Sanskrit āviṣ (openly, manifestly — literally "to the ear/perception") and the related verb āvíṣkr̥- (to make manifest) provide Indo-Iranian attestation of the base root.
The institutional uses of the audit- family are perhaps the root's most culturally significant legacy. An audit was originally a hearing — the King's auditors literally listened to the accounts being read. The shift from "hearing" to "examining" to "verifying" traces the evolution of governance from oral to written culture. We still speak of a court hearing, a Senate hearing, an audience with the Pope — all contexts where the act of listening carries formal institutional authority.