# a posteriori

> English word · Adjective

## Definitions
1. Involving induction of theories from facts.
2. Of a constructed language, Developed on a basis of languages which already exist.

## Etymology
Learned borrowing from Medieval Latin ā posteriōrī (“involving reasoning from effect to cause, from experience to theory”, literally “from what follows”). Popularized from the 19th century in reference to the work of Immanuel Kant.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/a-posteriori