A rule, applied to some controversialdebates and discussionpanels, stating that anybody who attends is free to use information from the discussion, but cannot reveal who made any comment.
Origin
Named after the headquarters of the UK Royal Institute of International Affairs, based in Chatham House, London, where the rule originated in June 1927.
Modern English dictionary
Explore and search massive catalog of over 900,000 word meanings.
Word of the Day
Get a curated memorable word every day.
Challenge yourself
Level up your vocabulary by setting personal goals.