ipso facto /ˌɪpsəʊ ˈfæktəʊ/adjective 1adverb 1 adjective1 •Being such by itself, or by its own definition; inherent.Is not the reading of another's diary an ipso facto act of voyeurism? — 1984 adverb1 •By that very fact itself; actually.We've imbued "natural food" with such virtuous connotations that meat supposedly raised according to the law of nature is, ipso facto, thought to be an ethically worthwhile choice. — 2011