From Longman Dictionary of Contemporary EnglishFreemasonFree‧ma‧son /ˈfriːˌmeɪsən, ˌfriːˈmeɪsən/ (also Mason) noun [countable] SSOa man who belongs to a secret society in which each member helps the other members to become successful
Examples from the Corpus
Freemason• So far as it is known, Noble has been the only born-deaf person ever to be a Freemason in Britain.• People relate to each other secretly, like Freemasons. 