noun

• (astronomy) A cluster.
• (astronomy) A cluster of galaxies — a galaxy cluster.
• (astronomy) A cluster of stars — a star cluster.
• close (in street addresses)
• (US, navy) Initialism of light cruiser, a type of warship
• (astronomy) Abbreviation of cluster. [A bunch or group of several discrete items that are close to each other.]
• (aviation) Initialism of lift coefficient.
• (baseball) Abbreviation of closer. [Someone or something that closes.]
• Initialism of containment level.
• (computing, uncountable) Initialism of computability logic. [(computing, mathematics) a formal theory of computability]
• Abbreviation of Catalonia. [An autonomous community of Spain.]