1st Baron Beaverbrook stba·ron·bea·verbrook uncommon noun 1. British newspaper publisher and politician (born in Canada); confidant of Winston Churchill (1879-1964) SynonymsBeaverbrook1st Baron BeaverbrookWilliam Maxwell Aitken Related words Broader terms publisherpolitician WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.