# ipso facto

idiom · CEFR C2 · Formal

Source: https://englishreference.com/idiom/ipso-facto
Updated: 2026-08-03

## Meaning

By that very fact — the consequence follows automatically, with no further step.

## Examples

- Breaking the contract ipso facto ends the agreement.
- He argued that anyone appointed by the previous board was ipso facto compromised, which was tidy and untrue.
- The clause is unusually severe: a missed payment does not trigger a notice period or a right to cure, it ipso facto converts the whole balance into a debt due that morning.

## Origin

Ipso facto means by the fact itself, and the whole force of it is in the word itself. Not because anyone decided, not after a hearing — the fact alone does the work. The phrase was sharpened by medieval canon and civil lawyers building on Roman legal Latin, who needed a way to mark penalties that took effect the moment an act was committed. An excommunication incurred ipso facto required no trial and no sentence; committing the act was the sentence. English keeps the automatic sense. To say that something is ipso facto true is to claim it needs no argument beyond the fact already on the table — which is why the phrase is used both by people making a genuinely airtight point and by people skipping the part where they prove it.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.