An "autodidact" is a self-taught person. Here's an example sentence:
He had no need for a teacher; being the autodidact that he is, he figured it out all by himself.
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Autodidact - album - was created in 1997.
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An autodidact person is a self-taught person; an autodidact
person is a person who taught himself or herself a subject without
any formal education or help from a teacher.
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The word autodidact is phonetically written aw-toh-dahy-dakt. The dahy has a long "i" sound, like in high.