Ipso facto is a Latin phrase, directly translated as "by the fact itself," which means that a certain phenomenon is a direct consequence, a resultant effect, of the action in question, instead of being brought about by a subsequent action such as the verdict of a tribunal. It is a term of art used in philosophy, law, and science. An example in law is money laundering: the act is not ipso facto illegal because it is done as a cover for something else, so the act puts the actions of an individual in question. A common English idiom with a similar meaning is "in and of itself".
Aside from its technical uses, it occurs frequently in literature, particularly in scholarly addenda: e.g., "Faustus had signed his life away, and was, ipso facto, incapable of repentance" (re: Christopher Marlowe, The Tragical History of Dr. Faustus) or "These prejudices are rooted in the idea that every tramp ipso facto is a blackguard" (re: George Orwell, Down and Out in Paris and London).
Read more about Ipso Facto: In Religion