autodidact
noun/ˌɔːtəʊˈdaɪdækt/
/ˌɔːtəʊˈdaɪdækt/
(formal)- a person who has taught himself or herself something rather than having lessonsWord Originmid 18th cent.: from Greek autodidaktos ‘self-taught’, from autos ‘self’ + didaskein ‘teach’.
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autodidact