Solipsism: The doctrine that a person has a direct awareness only of his or her own conscious states and is in some way cut off from the reality of other things. The extreme form of solipsism is ontological solipsism, which denies the reality of anything outside one’s own mind. The denials that a person can know the external world or other minds can be viewed as forms of epistemological solipsism.[1]

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[1]  C. Stephen Evans (2010-04-28). Pocket Dictionary of Apologetics & Philosophy of Religion (p. 109). Intervarsity Press. Kindle Edition.