Closure

Clo´sure Pronunciation: klō´zhũr; 135

n.	1.	The act of shutting; a closing; as, the closure of a chink.
	2.	That which closes or shuts; that by which separate parts are fastened or closed. Without a seal, wafer, or any closure whatever. - Pope.
	3.	That which incloses or confines; an inclosure. O thou bloody prison . . . Within the guilty closure of thy walls Richard the Second here was hacked to death. - Shak.
	4.	A conclusion; an end.
	5.	(Parliamentary Practice) A method of putting an end to debate and securing an immediate vote upon a measure before a legislative body. It is similar in effect to the previous question. It was first introduced into the British House of Commons in 1882. The French word clôture was originally applied to this proceeding.
	6.	(Math.) the property of being mathematically closed under some operation; - said of sets.
	7.	(Math.) the intersection of all closed sets containing the given set.
	8.	(Psychol.) achievement of a sense of completeness and release from tension due to uncertainty; as, the closure afforded by the funeral of a loved one; also, the sense of completion thus achieved.

Noun	1.	closure - approaching a particular destination; a coming closer; a narrowing of a gap; "the ship's rapid rate of closing gave them little time to avoid a collision" Synonyms: closing
	2.	closure - a rule for limiting or ending debate in a deliberative body Synonyms: cloture, gag law, gag rule
	3.	closure - a Gestalt principle of organization holding that there is an innate tendency to perceive incomplete objects as complete and to close or fill gaps and to perceive asymmetric stimuli as symmetric Synonyms: law of closure
	4.	closure - something settled or resolved; the outcome of decision making; "the finally reached a settlement with the union"; "they never did achieve a final resolution of their differences"; "he needed to grieve before he could achieve a sense of closure" Synonyms: resolution, settlement
	5.	closure - an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe" Synonyms: blockage, stoppage, occlusion, block, stop
	6.	closure - the act of blocking Synonyms: blockage, occlusion
	7.	closure - termination of operations; "they regretted the closure of the day care center" Synonyms: closedown, shutdown, closing
Verb	1.	closure - terminate debate by calling for a vote; "debate was closured"; "cloture the discussion" Synonyms: cloture

1.	(programming)	closure - In a reduction system, a closure is a data structure that holds an expression and an environment of variable bindings in which that expression is to be evaluated. The variables may be local or global. Closures are used to represent unevaluated expressions when implementing functional programming languages with lazy evaluation. In a real implementation, both expression and environment are represented by pointers. A suspension is a closure which includes a flag to say whether or not it has been evaluated. The term "thunk" has come to be synonymous with "closure" but originated outside functional programming.
2.	(theory)	closure - In domain theory, given a partially ordered set, D and a subset, X of D, the upward closure of X in D is the union over all x in X of the sets of all d in D such that x <= d. Thus the upward closure of X in D contains the elements of X and any greater element of D. A set is "upward closed" if it is the same as its upward closure, i.e. any d greater than an element is also an element. The downward closure (or "left closure") is similar but with d <= x. A downward closed set is one for which any d less than an element is also an element. ("<=" is written in LaTeX as \subseteq and the upward closure of X in D is written \uparrow_\D X).