ouïr means “hear” | MotiTan French Dictionary

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Le juge a ouï les témoins.

The judge heard the witnesses.

A sound or a report reaching the ear and leaving only the fact of having heard it.

entendre: To notice sounds or spoken words through the ears.
écouter: To listen attentively to sounds or spoken words.

Entendre au sens de percevoir par l'oreille ; emploi littéraire ou soutenu pour «entendre dire».

The modern form ouïr developed from Old French oïr, ultimately from Latin audire.

Ouïr is literary or formal today; ordinary conversation normally uses entendre for perceiving a sound and écouter for actively listening.