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closure [n]

1)	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

See Also:

approach close close close

2)	a rule for limiting or ending debate in a deliberative body

Synonyms :

cloture gag_law gag_rule

See Also:

order closure_by_compartment

3)	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

See Also:

gestalt_law_of_organization

4)	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

See Also:

deciding settle

5)	an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"

Synonyms :

block blockage occlusion stop stoppage

See Also:

impediment block breech_closer plug vapor_lock

6)	the act of blocking

Synonyms :

blockage occlusion

See Also:

obstruction block close close close block block block bar block implosion

7)	termination of operations; "they regretted the closure of the day care center"

Synonyms :

closedown closing shutdown

See Also:

conclusion close close close plant_closing bank_closing layoff

closure [v]

1)	terminate debate by calling for a vote; "debate was closured"; "cloture the discussion"

Synonyms :

cloture

See Also:

end

From The Free On-line Dictionary of Computing: (http://www.foldoc.org/, Editor Denis Howe)

1. 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. 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).

(1994-12-16)

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