| Arabic |
| lexicalization | ara: عقد 1840 |
| Aragonese |
| lexicalization | arg: Decenio de 1840 |
| Asturian |
| lexicalization | ast: Años 1840 |
| Bavarian |
| lexicalization | bar: 1840er |
| Belarusian |
| has gloss | bel: 1840-я |
| lexicalization | bel: 1840-я |
| Bosnian |
| lexicalization | bos: 1840te |
| Breton |
| lexicalization | bre: bloavezhioù 1840 |
| Catalan |
| lexicalization | cat: Dècada del 1840 |
| Chuvash |
| lexicalization | chv: 1840-мĕш çулсем |
| Welsh |
| has gloss | cym: 18fed ganrif - 19eg ganrif - 20fed ganrif 1790au 1800au 1810au 1820au 1830au - 1840au - 1850au 1860au 1870au 1880au 1890au 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |
| lexicalization | cym: 1840au |
| Danish |
| has gloss | dan: Århundreder: 18. århundrede - 19. århundrede - 20. århundrede |
| lexicalization | dan: 1840'erne |
| German |
| lexicalization | deu: 1840er |
| Esperanto |
| lexicalization | epo: 1840-aj jaroj |
| lexicalization | epo: 1840aj jaroj |
| Estonian |
| has gloss | est: 1840. aastad |
| lexicalization | est: 1840. aastad |
| Basque |
| has gloss | eus: 1840ko hamarkadak 1840etik 1849. urtera bitarteko iraupena du, biak barne. |
| lexicalization | eus: 1840ko hamarkada |
| Persian |
| has gloss | fas: دهه ۱۸۴۰ (میلادی) صد و هشتاد و چهارمین دهه تقویم میلادی است. مناسبتها رویدادها زادگان درگذشتگان |
| lexicalization | fas: دهه ۱۸۴۰ |
| Finnish |
| lexicalization | fin: 1840-luku |
| French |
| lexicalization | fra: Annees 1840 |
| lexicalization | fra: Années 1840 |
| Gan Chinese |
| has gloss | gan: 1840年代係指年到年之間嗰十年。 |
| lexicalization | gan: 1840年代 |
| Gaelic |
| lexicalization | gla: 1840an |
| lexicalization | gla: 1840s |
| Irish |
| has gloss | gle: | align=right cellpadding=3 id=toc style="margin-left: 15px;" |- | align="center" | Aois: 18ú haois - 19ú haois - 20ú haois |- | align="center" colspan=2 | Deichniúra: 1810í 1820í 1830í - 1840í - 1850í 1860í 1870í |- | align="center" colspan=2 | Blianta 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |} Imeachtaí agus treochtaí * An Gorta Mór in Éirinn |
| lexicalization | gle: 1840í |
| Manx |
| has gloss | glv: | align=right cellpadding=3 id=toc style="margin-left: 15px;" |- | align="center" | Eash: 18oo eash - 19oo eash - 20oo eash |- | align="center" colspan=2 | Jeihaghtyn: 1810í 1820í 1830í - 1840í - 1850í 1860í 1870í |- | align="center" colspan=2 | Bleeantyn 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |} Taghyrtyn * Yn Gortey Mooar ayns Nerin |
| lexicalization | glv: 1840yn |
| Serbo-Croatian |
| lexicalization | hbs: 1840e |
| Croatian |
| lexicalization | hrv: 1840-ih |
| Hungarian |
| lexicalization | hun: 1840-es évek |
| Ido |
| lexicalization | ido: 1840a yari |
| Indonesian |
| lexicalization | ind: 1840-an |
| Icelandic |
| lexicalization | isl: 1841-1850 |
| lexicalization | isl: 1841–1850 |
| Italian |
| lexicalization | ita: Anni 1840 |
| Javanese |
| lexicalization | jav: 1840-an |
| Lojban |
| has gloss | jbo: nio die cu liste le nanca dei 184moi naardekto .i lo 183moi naardekto cu purlai .ije lo 185moi naardekto cu bavlai |
| lexicalization | jbo: 184moi na'ardekto |
| lexicalization | jbo: 184xymoi |
| Japanese |
| has gloss | jpn: 年表: 18世紀 - 19世紀 - 20世紀 : 100年前 50年前 - 50年後 100年後 |
| lexicalization | jpn: 1840年代 |
| Georgian |
| lexicalization | kat: 1840-იანები |
| Kazakh |
| lexicalization | kaz: 1840 жж. |
| Komi |
| has gloss | kom: Сюрс кӧкъямыссё нелямынӧд вояс - 1841 восянь 1850 воӧдз. |
| lexicalization | kom: 1840-ӧд вояс |
| Korean |
| has gloss | kor: | align=right cellpadding=3 id=toc style="margin-left: 15px;" | align="center"| 세기 17세기 18세기 - 19세기 - 20세기 21세기 |- | align="center"| 연대 1820년대 1830년대 - 1840년대 - 1850년대 1860년대 |- | align="center"| 해 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |} |
| lexicalization | kor: 1840년대 |
| Kölsch |
| has gloss | ksh: De 1840-jo Joohre sinn_e Jozeent_jewääse. |
| lexicalization | ksh: 1840-er Joohre |
| lexicalization | ksh: 1840er Joohre |
| Latin |
| lexicalization | lat: Decennium 185 |
| Latvian |
| lexicalization | lav: 1840. gadi |
| Lithuanian |
| has gloss | lit: XIX amžiaus penktasis dešimtmetis prasidėjo 1841 metais ir baigėsi 1850 metais. |
| lexicalization | lit: XIX amžiaus 5-as dešimtmetis |
| Marathi |
| lexicalization | mar: इ.स.चे १८४० चे दशक |
| Macedonian |
| lexicalization | mkd: 1840-ти |
| Maltese |
| lexicalization | mlt: 1840s |
| Malay (macrolanguage) |
| has gloss | msa: Dekad 1840-an merupakan tahun-tahun dari 1840 hingga 1849. |
| lexicalization | msa: 1840-an |
| Min Nan Chinese |
| has gloss | nan: 1840 nî-tāi sī 1840 nî kàu 1849 nî ê 10 tang. |
| lexicalization | nan: 1840 nî-tāi |
| Dutch |
| lexicalization | nld: 1840-1849 |
| Norwegian Nynorsk |
| lexicalization | nno: 1840-åra |
| Norwegian |
| lexicalization | nor: 1840-årene |
| lexicalization | nor: Hendelser i 1840-årene |
| Ossetian |
| lexicalization | oss: 1840-тæ |
| Polish |
| has gloss | pol: Lata 40. XIX wieku |
| lexicalization | pol: Lata 40. XIX wieku |
| Portuguese |
| has gloss | por: Séculos: Século XVIII - Século XIX - Século XX |
| lexicalization | por: Década de 1840 |
| Quechua |
| has gloss | que: 1840 watakuna nisqa chunkantin watakunaqa 1 ñiqin qhulla puquy killapi 1840 watapi qallarirqan. 31 ñiqin qhapaq raymi killapi 1849 watapi puchukarqan. |
| lexicalization | que: 1840 watakuna |
| Moldavian |
| has gloss | ron: Secole: Secolul XVIII - Secolul XIX - Secolul XX |
| lexicalization | ron: Anii 1840 |
| Russian |
| lexicalization | rus: 1840-е годы |
| lexicalization | rus: 1840-е |
| Yakut |
| has gloss | sah: 1840-с cыллар. |
| lexicalization | sah: 1840-с |
| Sicilian |
| has gloss | scn: | align=right cellpadding=3 id=toc style="margin-left: 15px;" |- | align="center" colspan=2 | Dicini: 1820ini - 1830ini - 1840ini - 1850ini - 1860ini |- | align="center" | Sèculi: Sèculu XVIII - Sèculu XIX - Sèculu XX |} |
| lexicalization | scn: 1840ini |
| Slovak |
| has gloss | slk: | align="right" cellpadding="3" id="toc" style="margin-left: 15px;" |- | align="center" | Storočia: 18. storočie - 19. storočie - 20. storočie |- | align="center" colspan="2" | Dekády: 30. roky 19. storočia - 40. roky 19. storočia - 50. roky 19. storočia |- | align="center" colspan="2" | Roky: 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |} |
| lexicalization | slk: 40. roky 19. storočia |
| Slovenian |
| has gloss | slv: Stoletja: 18. stoletje - 19. stoletje - 20. stoletje |
| lexicalization | slv: 1840. |
| Northern Sami |
| has gloss | sme: | align=right cellpadding=3 id=toc style="margin-left: 15px;" |- | align="center" | Jagit: 1840 - 1841 - 1842 - 1843 - 1844 - 1845 - 1846 - 1847 - 1848 - 1849 |- | align="center" | Logijagit: 1820-lohku - 1830-lohku - 1840-lohku - 1850-lohku - 1860-lohku |- | align="center" | Jahkečuođit: 1700-lohku - 1800-lohku - 1900-lohku |} |
| lexicalization | sme: 1840-lohku |
| Castilian |
| lexicalization | spa: Anos 1840 |
| lexicalization | spa: Años 1840 |
| Albanian |
| has gloss | sqi: Mbi vitet 1840. |
| lexicalization | sqi: Vitet 1840 |
| Serbian |
| has gloss | srp: 18. век | 19. век | 20. век 1810е | 1820е | 1830е | 1840е | 1850е | 1860е | 1870е 1840 | 1841 | 1842 | 1843 | 1844 | 1845 | 1846 | 1847 | 1848 | 1849 |
| lexicalization | srp: 1840-е |
| lexicalization | srp: 1840е |
| Sundanese |
| has gloss | sun: 1840-an nyaéta dékade atawa dasawara sanggeus Maséhi dina kalénder Gregorian nu dimimitian ti taun 1840 nepi ka taun 1849. |
| lexicalization | sun: 1840-an |
| Swedish |
| lexicalization | swe: 1840-talet |
| Tamil |
| has gloss | tam: 1840கள் என்றழைக்கப்படும் பத்தாண்டு காலம் 1840ஆம் ஆண்டு துவங்கி 1849-இல் முடிவடைந்தது. |
| lexicalization | tam: 1840கள் |
| Tatar |
| has gloss | tat: ul 1840.–1849. yıllarınnan tora torğan unyıllıq yomğağı. |
| lexicalization | tat: 1840. yıllar |
| Telugu |
| lexicalization | tel: 1840లు |
| Tagalog |
| lexicalization | tgl: Dekada 1840 |
| Thai |
| lexicalization | tha: คริสต์ทศวรรษ 1840 |
| Turkmen |
| lexicalization | tuk: 1840ýý |
| Turkish |
| lexicalization | tur: 1840'lar |
| Ukrainian |
| lexicalization | ukr: 1840-ві |
| Uzbek |
| has gloss | uzb: 1840-lar |
| lexicalization | uzb: 1840-lar |
| Vietnamese |
| lexicalization | vie: Thập niên 1840 |
| Vlaams |
| lexicalization | vls: 1840-1849 |
| Walloon |
| has gloss | wln: 18inme sieke | 19inme sieke | 20inme sieke |
| lexicalization | wln: Anêyes 1840 |
| Yue Chinese |
| has gloss | yue: 1840年代係指年去到年之間嗰十年。 |
| lexicalization | yue: 1840年代 |
| Chinese |
| has gloss | zho: 世纪：18世纪－19世纪－20世纪 |
| lexicalization | zho: 1840年代 |
