the act of closing; the state of being closed.
a bringing to an end; conclusion.
something that closes or shuts.
closer ( def 2 ).
an architectural screen or parapet, especially one standing free between columns or piers.
Phonetics. an occlusion of the vocal tract as an articulatory feature of a particular speech sound. Compare constriction ( def 5 ).
Parliamentary Procedure. a cloture.
Surveying. completion of a closed traverse in such a way that the point of origin and the endpoint coincide within an acceptably small margin of error. Compare error of closure.
the property of being closed with respect to a particular operation.
the intersection of all closed sets that contain a given set.
the tendency to see an entire figure even though the picture of it is incomplete, based primarily on the viewer's past experience.
a sense of psychological certainty or completeness: a need for closure.
Obsolete. something that encloses or shuts in; enclosure.
verb (used with object), verb (used without object), closured, closuring.
Parliamentary Procedure. to cloture.

1350–1400; Middle English < Middle French < Latin clausūra. See close, -ure

nonclosure, noun
preclosure, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
closure (ˈkləʊʒə)
1.  the act of closing or the state of being closed
2.  an end or conclusion
3.  something that closes or shuts, such as a cap or seal for a container
4.  cloture guillotine See also gag rule (in a deliberative body) a procedure by which debate may be halted and an immediate vote taken
5.  chiefly (US)
 a.  the resolution of a significant event or relationship in a person's life
 b.  a sense of contentment experienced after such a resolution
6.  geology the vertical distance between the crest of an anticline and the lowest contour that surrounds it
7.  phonetics the obstruction of the breath stream at some point along the vocal tract, such as the complete occlusion preliminary to the articulation of a stop
8.  logic
 a.  the closed sentence formed from a given open sentence by prefixing universal or existential quantifiers to bind all its free variables
 b.  the process of forming such a closed sentence
9.  maths
 a.  the smallest closed set containing a given set
 b.  the operation of forming such a set
10.  psychol the tendency, first noted by Gestalt psychologists, to see an incomplete figure like a circle with a gap in it as more complete than it is
11.  (tr) (in a deliberative body) to end (debate) by closure
[C14: from Old French, from Late Latin clausūra bar, from Latin claudere to close]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. closure "that which encloses," from L. clausura "lock, fortress, a closing," from pp. stem of claudere "to close" (see close (v.)). Originally "a fence," sense of "bringing to a close" is from early 15c. Sense of "tendency to create ordered and satisfying
wholes" is 1924, from Gestalt psychology.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

closure definition

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 ("LaTeX as \subseteq and the upward closure of X in D is written \uparrow_\D X).
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Ford announced its decision to close the plant several months ago but did not
  set a date for closure.
However, the drop was largely due to the temporary closure of a car plant.
Yet the facilities where these organisms are cataloged and studied are
  deteriorating to the point where some even face closure.
The last block on a long wall, called the closure block, is a bit tricky to
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