antirealism is a modern philosophical formation from anti- ('against') + realism, the latter from Latin reālis ('actual'), from rēs ('thing, matter'). Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the noun sense is "the philosophical view denying objective reality independent of perception", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as realism, real, reality and derivatives such as antirealist, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Ancient Greek antí, Latin rēs, which anchor the explanation in named linguistic material.