From this page you can browse articles translated and published online by English or French title, category of knowledge, or both. You can also browse all of the plates (whether or not the accompanying text has been translated) by English or French title. Also see auxiliary material such as the Map of the System of Human Knowledge.
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| Title | Tître |
| Ugliness | Laideur |
| Ukraine | Ukraine |
| Ulysses | Ulysse |
| Understand, to | Comprendre |
| Unicorn | Licorne |
| Unicorn fossil | Licorne fossile |
| Unigenitus, constitution | Unigenitus, constitution |
| Unitarians | Unitaires |
| Universal arithmetic | Arithmétique universelle |
| Universe | Univers |
| University | Université |
| Unknown | Inconnu |
| Uproot | Arracher |
| Ursa | Ourse |
| Ursa | Ourse |
| Ushant | Ouessant |
| Usurpation | Usurpation |
| Usurpation | Usurpation |
| Uterine fury | Fureur utérine |
| Uterus | Uterus |
| Uzerche | Uzerche |