English: theory, doctrine (well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge)
العربية: نظرية
Deutsch: die Theorie
Nederlands: theorie
Esperanto: teorio
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简体中文: 理论
繁體中文: 理論
(pīnyīn): lǐ lùn
Português: a teoria
日本語: 原理 [げんり], 学説 [がくせつ], セオリー, 原論 [げんろん], 説 [せつ], 理論 [りろん]
Ελληνικά: θεωρία
Morphology: noun
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Español: teorìa
Français: la théorie
Italiano: teoria
Suomi: teoria
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