The body part you use to hear sounds, and also the part on the outside of your head that you can see.
From Old English 'ēare', from Proto-Germanic '*ausō', related to words for hearing in several ancient languages. The basic form and meaning have changed very little over thousands of years.
The word 'ear' is ancient, and many languages use very similar sounds for it. We also use 'ear' metaphorically, like 'have an ear for music', to mean a special talent for hearing patterns.
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