An area of land owned or controlled by someone, or a particular field of activity, knowledge, or influence. In computing, it also means a named area of the internet, like 'example.com'.
From Old French 'demeine' or 'domain', from Latin 'dominium' meaning 'ownership, property', from 'dominus' meaning 'lord, master'. It originally referred to land directly controlled by a lord. The idea later expanded to abstract areas of control, like knowledge or the internet.
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