A movable barrier, usually made of wood, metal, or glass, that opens and closes to let people enter or leave a space. It can also be used metaphorically for an opportunity or way into a situation.
From Old English 'duru' or 'dor', meaning 'door, gate', from Proto-Germanic '*durō'. It is related to German 'Tür' and Dutch 'deur'. The basic meaning has stayed almost unchanged for over a thousand years.
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