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More completely, etiology is the study of the causes, origins, or reasons behind the way that things are, or the way they function, or it can refer to the causes themselves.
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Cause, also known as etiology and aetiology, is the reason or origination of something. The word etiology is derived from the Greek αἰτιολογία, aitiologia, ...
Etymology is the scientific study of the origin and evolution of a word's semantic meaning across time, including its constituent morphemes and phonemes.