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  <page>
    <title>theory</title>
    <id>7354</id>
    <revision>
      <id>6994162</id>
      <timestamp>2009-07-17T08:57:33Z</timestamp>
      <contributor>
        <username>Tbot</username>
        <id>44393</id>
      </contributor>
      <minor/>
      <comment>updated t/t-/t+ templates</comment>
      <text xml:space="preserve">==English==

===Etymology===
English since 1613, from French ''[[théorie]]'' &lt; Latin ''[[theoria]]'' &lt; Greek {{polytonic|[[θεωρία]]}} (&quot;contemplation, speculation, a looking at, things looked at&quot;) &lt; {{polytonic|[[θεωρέω]]}} (to look at, view, consider, examine) &lt; {{polytonic|[[θεωρός]]}} (spectator) &lt; {{polytonic|[[θέα]]}} (a view) + {{polytonic|[[ὁράω]]}} (to see, to look).

===Pronunciation===
* {{audio|en-us-theory.ogg|Audio (US)}}
*: {{rhymes|ɪəri}}

===Noun===
{{en-noun|theor|ies|-}}

# {{countable}} An [[unproven]] [[conjecture]].
#: ''I have a '''theory''' about who broke into the school last night, but I have no proof to back it up.''
# {{uncountable}} An [[expectation]] of what [[should]] [[happen]], [[barring]] [[unforeseen]] [[circumstances]].
#: ''So we’ll be there in three hours?'' — ''That’s the '''theory'''.''
# {{countable}} {{science}} A [[coherent]] [[statement]] or set of statements that [[attempt]]s to [[explain]] [[observe]]d [[phenomenon|phenomena]].
#: ''There is now a well-developed '''theory''' of electrical charge.''
# {{countable}} {{science}} A [[logical]] structure that enables one to [[deduce]] the possible results of every [[experiment]] that falls within its purview.
#: ''The '''theory''' of relativity was proposed by Einstein.''
# {{uncountable}} {{mathematics}} A [[field]] of [[study]] attempting to [[exhaustive]]ly [[describe]] a particular [[class]] of [[construct]]s. &lt;!-- Not quite broad enough to include &quot;music theory&quot;. Where do we put that? --&gt;
#: ''Knot '''theory''' classifies the mappings of a circle into 3-space.''
# {{countable}} {{logic}} A [[set]] of [[axiom]]s together with all [[statement]]s [[derivable]] from them.
#: ''A '''theory''' is consistent if it has a model.''

====Synonyms====
* See also [[Wikisaurus:supposition]]

====Derived terms====
{{rel-top3|terms derived from theory}}
* [[acoustic theory]]
* [[algorithmic information theory]]
* [[antenna theory]]
* [[atomic theory]]
* [[catastrophe theory]]
* [[category theory]]
* [[cell theory]]
* [[chaos theory]]
* [[circuit theory]]
* [[complexity theory]]
* [[computation theory]]
* [[control theory]]
* [[critical theory]]
* [[decision theory]]
{{rel-mid3}}
* [[domino theory]]
* [[extreme value theory]]
* [[game theory]]
* [[giant impact theory]]
* [[graph theory]]
* [[group theory]]
* [[in theory]]
* [[information theory]]
* [[kinetic theory of gases]]
* [[knot theory]]
* [[literary theory]]
* [[music theory]]
* [[number theory]]
* [[phlogiston theory]]
{{rel-mid3}}
* [[probability theory]]
* [[proof theory]]
* [[quantum field theory]]
* [[rational choice theory]]
* [[set theory]]
* [[signal theory]]
* [[social theory]]
* [[systems theory]]
* [[theory of gravity]]
* [[theory of relativity]]
* [[theory of truth]]
* [[type theory]]
* [[value theory]]
* [[virtue theory]]
{{rel-bottom}}

====Related terms====
* [[theorem]]
* [[theoretical]]
* [[theorise]], [[theorize]]

====Translations====
{{trans-top|an unproven conjecture}}
* Arabic: {{Arab|[[نظرية]]}} {{unicode|(naʐaríya)}} {{f}}
* Armenian: [[տեսություն]] (tesut'yun)
* Croatian: {{t-|hr|teorija|f}}
* Dutch: {{t+|nl|theorie}}
* Finnish: {{t-|fi|teoria}}
* French: {{t+|fr|théorie|f}}
* German: {{t+|de|Theorie|f}}
* Greek: {{t+|el|θεωρία|f|sc=Grek}}
* Italian: {{t+|it|teoria|f}}
* Japanese: {{t|ja|憶測|tr=okusoku|sc=Jpan}}, {{t|ja|推測|tr=suisoku|sc=Jpan}}, {{t-|ja|推論|tr=suiron|sc=Jpan}}, {{t|ja|見解|tr=kenkai|sc=Jpan}}
{{trans-mid}}
* [[Macedonian]]: {{t|mk|теорија|f|tr=teórija|sc=Cyrl|xs=Macedonian}}
* Maltese: {{t-|mt|teorija|xs=Maltese}}
* Norwegian: {{t-|no|teori|m}}
* Polish: {{t+|pl|teoria|f}}
* Portuguese: {{t+|pt|teoria|f}}
* Russian: {{t+|ru|теория|f|tr=teórija|sc=Cyrl}}, {{t|ru|гипотеза|f|tr=gipóteza|sc=Cyrl}}
* Spanish: {{t-|es|teoría|f}}
* Swedish: {{t+|sv|teori|c}}
{{trans-bottom}}

{{trans-top|(uncountable) expectation}}
* Arabic: {{Arab|[[نظرية]]}} {{unicode|(naʐaríya)}} {{f}}
* Croatian: {{t-|hr|teorija|f}}
* Dutch: {{t+|nl|theorie}}
* Finnish: {{t-|fi|teoria}}
* German: {{t+|de|Theorie|f}}
* Japanese: {{t+|ja|理論|tr=riron|sc=Jpan}}, {{t-|ja|推論|tr=suiron|sc=Jpan}}
* [[Macedonian]]: {{t|mk|теорија|f|tr=teórija|sc=Cyrl|xs=Macedonian}}
{{trans-mid}}
* Norwegian: {{t-|no|idé|m}}, {{t-|no|teori|m}}
* Polish: {{t+|pl|teoria|f}}
* Portuguese: {{t+|pt|teoria|f}}
* Russian: {{t+|ru|теория|f|tr=teórija|sc=Cyrl}}
* Spanish: {{t-|es|teoría|f}}
* Swedish: {{t+|sv|idé|c}}, {{t+|sv|teori|c}}
{{trans-bottom}}

{{trans-top|a coherent set of statements attempting to explain observed phenomena}}
* Arabic: {{Arab|[[نظرية]]}} {{unicode|(naʐaríya)}} {{f}}
* Croatian: {{t-|hr|teorija|f}}
* Czech: {{t+|cs|teorie|f}}
* Dutch: {{t+|nl|theorie}}
* Finnish: {{t-|fi|teoria}}
* French: {{t+|fr|théorie|f}}
* German: {{t+|de|Theorie|f}}
* Greek: {{t+|el|θεωρία|f|sc=Grek}}
* Japanese: {{t+|ja|理論|tr=riron|sc=Jpan}}, {{t|ja|学説|tr=gakusetsu|sc=Jpan}}
{{trans-mid}}
* [[Macedonian]]: {{t|mk|теорија|f|tr=teórija|sc=Cyrl|xs=Macedonian}}
* Maltese: {{t-|mt|teorija|xs=Maltese}}
* Norwegian: {{t-|no|teori|m}}
* Polish: {{t+|pl|teoria|f}}
* Portuguese: {{t+|pt|teoria|f}}
* Russian: {{t+|ru|теория|f|tr=teórija|sc=Cyrl}}
* Spanish: {{t-|es|teoría|f}}
* Swedish: {{t+|sv|teori|c}}
{{trans-bottom}}

{{trans-top|science: a logical structure that enables one to deduce the possible results}}
* Croatian: {{t-|hr|teorija|f}}
* Dutch: {{t+|nl|theorie}}
* Greek: {{t+|el|θεωρία|f|sc=Grek}}
* Japanese: {{t-|ja|定理|tr=teiri|sc=Jpan}}, {{t+|ja|理論|tr=riron|sc=Jpan}}, {{t|ja|学説|tr=gakusetsu|sc=Jpan}}
* [[Macedonian]]: {{t|mk|теорија|f|tr=teórija|sc=Cyrl|xs=Macedonian}}
* Norwegian: {{t-|no|teori|m}}
{{trans-mid}}
* Polish: {{t+|pl|teoria|f}}
* Portuguese: {{t+|pt|teoria|f}}
* Russian: {{t+|ru|теория|f|tr=teórija|sc=Cyrl}}
* Spanish: {{t-|es|teoría|f}}
* Swedish: {{t+|sv|teori|c}}
{{trans-bottom}}

{{trans-top|a field of study in mathematics}}
* Croatian: {{t-|hr|teorija|f}}
* Dutch: {{t+|nl|theorie}}
* Finnish: {{t-|fi|teoria}}
* French: {{t+|fr|théorie|f}}
* German: {{t+|de|Theorie|f}}
* Greek: {{t+|el|θεωρία|f|sc=Grek}}
* Italian: {{t+|it|teoria|f}}
* Japanese: {{t-|ja|定理|tr=teiri|sc=Jpan}}, {{t+|ja|理論|tr=riron|sc=Jpan}}, {{t|ja|学説|tr=gakusetsu|sc=Jpan}}
{{trans-mid}}
* [[Macedonian]]: {{t|mk|теорија|f|tr=teórija|sc=Cyrl|xs=Macedonian}}
* Maltese: {{t-|mt|teorija|xs=Maltese}}
* Norwegian: {{t-|no|teori|m}}
* Polish: {{t+|pl|teoria|f}}
* Portuguese: {{t+|pt|teoria|f}}
* Russian: {{t+|ru|теория|f|tr=teórija|sc=Cyrl}}
* Spanish: {{t-|es|teoría|f}}
* Swedish: {{t+|sv|teori|c}}
{{trans-bottom}}

{{trans-top|in logic: a set of axioms and all statements derivable from them}}
* Croatian: {{t-|hr|teorija|f}}
* Dutch: {{t+|nl|theorie}}
* Finnish: {{t-|fi|teoria}}
* German: {{t+|de|Theorie|f}}
* Japanese: {{t-|ja|定理|tr=teiri|sc=Jpan}}
* [[Macedonian]]: {{t|mk|теорија|f|tr=teórija|sc=Cyrl|xs=Macedonian}}
{{trans-mid}}
* Norwegian: {{t-|no|teori|m}}
* Polish: {{t+|pl|teoria|f}}
* Portuguese: {{t+|pt|teoria|f}}
* Russian: {{t+|ru|теория|f|tr=t'eórija|sc=Cyrl}}
* Spanish: {{t-|es|teoría|f}}
* Swedish: {{t+|sv|teori|c}}
{{trans-bottom}}

{{checktrans-top}}
* {{ttbc|Arabic}}: {{Arab|[[نظرية]]}} {{unicode|(naʐaríya)}} {{f}}
* {{ttbc|Chinese}}: {{zh|tsp|理論|理论|lǐlùn}}; {{zh|tsp|論|论|lùn}}; {{zh|tsp|學説|学说|xuéshuō}}; [[道理]] (dàolǐ)
* {{ttbc|Indonesian}}: {{t-|id|teori|xs=Indonesian}}
* {{ttbc|Italian}}: {{t+|it|teoria|f}}
{{trans-mid}}
* {{ttbc|Korean}}: [[이론]] (iron)
* {{ttbc|Turkish}}: {{t+|tr|teori}}
* {{ttbc|Vietnamese}}: {{t|vi|thuyết|xs=Vietnamese}}, {{t+|vi|lý thuyết|xs=Vietnamese}}
{{trans-bottom}}

===See also===
* [[axiom]]
* [[postulate]]
* [[proposition]]

[[Category:1000 English basic words]]
[[Category:Check translations]]
[[Category:Greek derivations]]

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[[zh:theory]]</text>
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