Clique entered English from French in the early 18th century, carrying connotations of exclusivity, insularity, and social gatekeeping. The French clique had designated a faction, coterie, or exclusive group since at least the 16th century. Its deeper etymology is debated: the most common theory connects it to Old French cliquer ("to click, to make a sharp snapping sound"), suggesting either the click of a latch closing (the group shuts others out) or the figurative snapping together of people who align closely with each other.
The word's entry into English coincided with an era of intense social stratification and club culture. 18th-century London society was organized around clubs, coffeehouses, and social circles that were explicitly exclusive. The clique represented the informal version of this exclusivity — not an institution with rules and membership lists, but an organic social formation that achieved the same gatekeeping through unspoken codes of acceptance and rejection.
The sociological concept of the clique has been formally studied since the early 20th century. Sociometric analysis, developed by Jacob Moreno in the 1930s, mapped social relationships within groups, identifying cliques as densely connected subgroups within larger social networks. The dynamics of clique formation — the way small groups naturally coalesce around shared interests, mutual attraction, and exclusionary boundaries — are among the most studied phenomena in social psychology.
In mathematics and computer science, "clique" has been adopted as a technical term with precise definition. In graph theory, a clique is a subset of vertices in a graph such that every pair of vertices in the subset is connected by an edge. The Clique Problem — determining whether a graph contains a clique of at least a given size k — is one of Richard Karp's 21 NP-complete problems (1972). It has implications for computational complexity theory, data mining, and network analysis. The mathematical clique precisely formalizes the social intuition: a group where everyone knows
The word retains a predominantly negative connotation in English. To call a group a "clique" is to accuse it of excessive exclusivity and insularity. "Cliquish" and "cliquey" are unambiguously pejorative. This negative charge distinguishes clique from neutral alternatives like "circle," "group," or "set," making it one of English's most socially loaded collective nouns.