Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Ancient Greek θεωρία
Ancient Greek θεωρός (affix)
Ancient Greek -ῐ́ᾱ (affix)
Proto-Indo-European *wer- (root)

English theory (derived)
Catalan teoria (derived)
Greek θεωρία (derived)
Esperanto teorio (derived)
Spanish teoría (derived)
Finnish teoria (derived)
French théorie (derived)
Galician teoría (derived)
Ancient Greek θεωρικός (affix)
Indonesian teori (derived)
Ido teorio (derived)
Kazakh теория (derived)
Latin theoria (borrowed)
Latvian teorija (derived)
Norwegian Bokmål teori (derived)
Norwegian Nynorsk teori (derived)
Occitan teoria (derived)
Polish teoria (derived)
Portuguese teoria (mention)