A native or inhabitant of Earth; relating to Earth and its people (often used in science fiction).
From 'Earth' plus the suffix '-ian' (inhabitant of). A neologism popularized by science fiction literature, mimicking forms like 'Martian' or 'Venusian.'
Science fiction writers needed a word to distinguish humanity from aliens, so 'Earthian' was born—yet it's rarely used because most authors just say 'human' instead, showing how context shapes which words actually survive in a language.
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