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closed set

noun Mathematics.

a set that contains all of its accumulation points, as the set of points on and within a circle; a set having an open set as its complement.

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You may have read the word "simmer" in a recipe or two, but what does it really mean?
To cook in water that begins cold and then reaches a boil.
To stew in a sauce for a long time.
To cook in water, just below boiling temperature.
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Words nearby closed set

closed reduction, closed rule, closed scholarship, closed season, closed sentence, closed set, closed shelf, closed shell, closed shop, closed source, closed-stack
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for closed set

closed set

noun maths

a set that includes all the values obtained by application of a given operation to its members
(in topological space) a set that contains all its own limit points
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012