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closure    音標拼音: [kl'oʒɚ]
n. 關閉
vt. 使終止

關閉使終止

closure
閉包

closure
封閉 閉

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" [synonym: {closing},
{closure}]
2: a rule for limiting or ending debate in a deliberative body
[synonym: {closure}, {cloture}, {gag rule}, {gag law}]
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 [synonym: {closure}, {law of closure}]
4: something settled or resolved; the outcome of decision
making; "they 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" [synonym: {settlement}, {resolution},
{closure}]
5: an obstruction in a pipe or tube; "we had to call a plumber
to clear out the blockage in the drainpipe" [synonym: {blockage},
{block}, {closure}, {occlusion}, {stop}, {stoppage}]
6: the act of blocking [synonym: {blockage}, {closure}, {occlusion}]
7: termination of operations; "they regretted the closure of the
day care center" [synonym: {closure}, {closedown}, {closing},
{shutdown}]
v 1: terminate debate by calling for a vote; "debate was
closured"; "cloture the discussion" [synonym: {closure},
{cloture}]

Closure \Clo"sure\ (kl[=o]"zh[-u]r; 135), n. [Of. closure, L.
clausura, fr. clauedere to shut. See {Close}, v. t.]
1. The act of shutting; a closing; as, the closure of a
chink.
[1913 Webster]

2. That which closes or shuts; that by which separate parts
are fastened or closed.
[1913 Webster]

Without a seal, wafer, or any closure whatever.
--Pope.
[1913 Webster]

3. That which incloses or confines; an inclosure.
[1913 Webster]

O thou bloody prison . . .
Within the guilty closure of thy walls
Richard the Second here was hacked to death. --Shak.
[1913 Webster]

4. A conclusion; an end. [Obs.] --Shak.
[1913 Webster]

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
cl[^o]ture was originally applied to this proceeding.
[1913 Webster]

6. (Math.) the property of being mathematically closed under
some operation; -- said of sets.
[PJC]

7. (Math.) the intersection of all closed sets containing the
given set.
[PJC]

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.
[PJC]

103 Moby Thesaurus words for "closure":
accomplishment, ankle, arrest, arrestation, arrestment,
articulation, blockage, blocking, boundary, butt, cease, cervix,
cessation, check, clinch, clogging, close, closing, closing up,
completion, conclusion, connecting link, connecting rod,
connection, constriction, consummation, coupling, cramp,
culmination, delay, desistance, detainment, detention, dovetail,
elbow, embrace, end, ending, fixation, foot-dragging, fulfillment,
gliding joint, hampering, hindering, hindrance, hinge,
hinged joint, hip, holdback, holdup, impediment, inhibition,
interface, interference, interruption, join, joining, joint,
juncture, knee, knuckle, let, link, miter, mortise, neck,
negativism, nuisance value, obstruction, obstructionism, occlusion,
opposition, perfection, pivot, pivot joint, rabbet, realization,
repression, resistance, restraint, restriction, retardation,
retardment, scarf, seam, setback, shoulder, squeeze, stitch, stop,
stranglehold, stricture, suppression, suture, symphysis,
termination, tie rod, toggle, toggle joint, topping-off, union,
weld, wrist

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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