Solipsism--this great word was a favorite of two characters in The Tao of Steve. So it seems worth looking at more closely.
solipsism: The theory that the self is the only thing that can be known or verified.
A little more detail from Wikipedia, including the origins of this philosophy, from Greek presocratic sophist, Gorgias.
So it posits that the individual self is the whole of reality, and that others and the external world are representations of that self having no independent existence.
A tad egocentric, don't you think?
Though I'll grant you that everyone's reality is different, and tinged by his or her own viewpoint and experience.
Not to be confused with solecism, which is a socially awkward or tactless act (gaffe or faux pas). Or a non-standard grammatical usage, an impropriety, mistake or incongruity.
You'll never see any solecisms here. Hah. Maybe I should say, check here for your daily solecism.
[Illustration from Dinosaur Comics]