The quality of being exclusive or favoring members of a particular group while excluding others, like how a club only lets certain people in.
From 'clubbish' (adjective meaning exclusive or cliquish) plus the suffix '-ness' meaning state or quality. 'Clubbish' comes from 'club,' originally meaning a group of people meeting socially, which derives from Old Norse 'klubba' meaning wooden cudgel or lump.
This word captures something fascinating about human nature—we've been forming exclusive groups since ancient times, and the word itself evolved from objects (clubs/sticks) to social organizations! It shows how language reflects our tribal instinct to form 'us versus them' groups.
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