| Albanian | ide |
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| Catalan | idea |
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| Czech | nápad; pojem; představa |
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| Danish | begreb; idé; opfattelse |
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| Dutch | begrip; benul; denkbeeld; voorstelling; idee; notie; opvatting |
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| English | idea |
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| Esperanto | ideo |
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| Faeroese | hugmynd; hugsjón; hugskot |
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| Finnish | aate; ajatus |
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| French | idée |
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| German | Gedanke; Idee; Vorstellung; Begriff; Grundgedanke |
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| Greek | ιδέα |
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| Greek (Classical Greek) | ἰδέα |
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| Hungarian | ötlet |
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| Icelandic | álit |
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| Low German | idee; begrip |
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| Malay | ide; pikiran |
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| Norwegian | oppfatning |
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| Papiamento | idea |
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| Polish | idea; myśl; pomysł |
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| Portuguese | ideia |
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| Romanian | idee |
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| Saterland Frisian | Toacht; Idee; Foarstaalenge |
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| Spanish | idea |
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| Swedish | idé |
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| Turkish | fikir |
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