# Ponsonby Rule

> English word · Proper noun

## Definitions
1. A constitutional convention (which acquired legal force in 2010) dictating that most international treaties had to be laid before Parliament 21 days before ratification.

## Etymology
Named after British politician and legislator Arthur Ponsonby, 1st Baron Ponsonby of Shulbrede.

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