'autocosm' originates from Modern English, specifically coined from Greek elements 'auto-' and 'kosmos', where 'auto-' meant 'self' and 'kosmos' meant 'order; world'.

'autocosm' was formed in Modern English by combining the Greek roots 'auto-' and 'kosmos' and was popularized as a neologism (notably by John Koenig's "Dictionary of Obscure Sorrows").

Initially coined to denote a self-created or self-centered private universe; the meaning has remained essentially the same as a label for an individual's subjective world.