# de facto

idiom · CEFR C1 · Formal

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

## Meaning

In practice, whatever the official position says.

## Examples

- She has no title, but she is the de facto manager.
- English has become the de facto language of the conference, whatever the programme says.
- The format was never ratified by any standards body and became the de facto standard anyway, which is how most standards are actually made and almost none are officially described.

## Origin

Roman law drew a hard line between a question of fact and a question of law, and a great deal of Roman legal reasoning consists of sorting one from the other. De facto — from the fact — is the label for the first side of that line. The paired tags de facto and de jure were sharpened by medieval and early-modern jurists, who needed a clean way to describe rulers who held power without a legal title. A de facto government is the one actually governing; a de jure government is the one entitled to. For long stretches of European history these were different people, sometimes in different countries. English uses de facto far beyond the law, for any arrangement that is real without being official — a de facto capital, a de facto standard, a de facto deputy who has never been given the job.

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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.