# proemptosis

> English word · Noun

## Definitions
1. The addition of a leap day to the lunar calendar.

## Etymology
From New Latin proemptōsis, from Ancient Greek προ- (pro-, “before”) + ἔμπτωσις (émptōsis, “falling”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/proemptosis