Solipsism is the idea that only your own mind is sure to exist, and everything else might be just in your head. It is a very extreme form of philosophical doubt.
From Latin *solus* “alone” + *ipse* “self,” forming a word that roughly means “only oneself.” It entered English through academic philosophical writing in the 19th century.
Solipsism is like living in a video game and seriously wondering if every other character is just a very convincing bot. It takes the question “How do I know what’s real?” to its absolute, lonely limit.
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