Main Entry:

closed

Pronunciation:

\ˈklōzd\

Function:

adjective

Date:

13th century

1 a: not open b: enclosed c: composed entirely of closed tubes or vessels <a closed circulatory system>2 a: forming a self-contained unit allowing no additions <closed association> b (1): traced by a moving point that returns to an arbitrary starting point <closed curve> ; also : so formed that every plane section is a closed curve <closed surface> (2): characterized by mathematical elements that when subjected to an operation produce only elements of the same set <the set of whole numbers is closed under addition and multiplication> (3): containing all the limit points of every possible subset <a closed interval contains its endpoints> c: characterized by continuous return and reuse of the working substance <a closed cooling system> dof a racecourse : having the same starting and finishing point3 a: confined to a few <closed membership> b: excluding participation of outsiders or witnesses : conducted in strict secrecy c: rigidly excluding outside influence <a closed mind>4: ending in a consonant <closed syllable>