Back عقد 1840 Arabic عوام 1840 ARY عقد 1840 ARZ Década del 1840 AST 1840-cı illər Azerbaijani 1840-an BAN 1840-я Byelorussian 1840-я BE-X-OLD 1840-те Bulgarian Bloavezhioù 1840 Breton
| Decenios: Anyos 1830 - Anyos 1840 - Anyos 1850 |
| Anyos: 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |
| Sieglos: Sieglo XVIII - Sieglo XIX - Sieglo XX |
Os anyos 1840 ye o periodo de tiempo formau por os anyos entre l'anyo 1840 y l'anyo 1849, istos dos tamién incluyius.
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