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autograph[autograph 词源字典]

autograph: [17] Greek auto- was a prefixal use of the adjective autós, meaning ‘same, self’. Many of the commonest auto- words in English, including autograph itself and also autocrat [19], automatic [18] (a derivative of automaton [17], which was formed from a hypothetical base *men- ‘think’ related to mental and mind), autonomy [17], and autopsy [17] (originally meaning ‘eye-witness’, and derived from Greek optós ‘seen’, source of English optic), are original Greek formations.

But the 19th and particularly the 20th century have seen a mass of new coinages, notably in scientific and technical terminology, including such familiar words as autism, autobiography, autoerotic, autofocus, autogiro, autoimmune, automotive, autosuggestion, and of course automobile (originally a French formation of the 1870s). Automobile has itself, of course, given rise to a completely new use for the auto- prefix, with the general connotation of ‘motorized transport’, as in autobus, autocar, autocycle, and the German autobahn.
[autograph etymology, autograph origin, 英语词源]