Ipso facto is a New Latin term meaning ‘by the nature of the deed’ or ‘by the fact itself.’ It refers to something, for example a penalty, that is a direct consequence brought about by an action or offence. It is not commonly used in everyday speech, and is commonly thought of as ‘jargon’ in law, technology and science.
Ipso facto literally means ‘by that very fact.’ Sources conflict as to its first recorded use in the English language, but sources most commonly point to the mid-16th century. But it has appeared in famous literary works such as Christopher Marlowe’s Dr Faustus.
Ipso facto is sometimes misused, especially in the ‘blogosphere,’ in the place of ‘in fact’; this is understandable, but erroneous.
The term should only be used to describe something that is a direct result of a fact or action. Examples of use in a sentence include:
‘Bob turned up to band practise without his guitar, and ipso facto was kicked out.’
‘She talked about herself all the time. Ipso facto, no one liked speaking with her.’
Despite the usage above which were written for the purpose of example only, please keep in mind that ipso facto is still relatively uncommon in informal use.