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Wiktionary
autodidacticism

alt. Self-education; self-directed learning. n. Self-education; self-directed learning.

Wikipedia
Autodidacticism

Autodidacticism (also autodidactism) or self-education (also self-learning and self-teaching) is the act of learning about a subject or subjects in which one has had little to no formal education. Many notable contributions have been made by autodidacts.