| Part of speech | common noun |
|---|---|
| Hyphenation | de·cembr·o |
| Singular | Plural | |
|---|---|---|
| Nominative | decembro | decembroj |
| Accusative | decembron | decembrojn |
| Afrikaans | Desember |
|---|---|
| Albanian | dhjetor |
| Catalan | desembre |
| Czech | prosinec |
| Danish | december; kristmåned; julemåned |
| Dutch | december; wintermaand |
| English | December |
| Faeroese | desember |
| Finnish | joulukuu |
| French | décembre |
| German | Dezember; Julmond; Julmonat; Christmond; Christmonat; Heiligmond; Heiligmonat; Schlachtmond; Schlachtmonat; Weihemond; Weihemonat; Weihnachtsmond; Weihnachtsmonat; Wintermond; Wintermonat; Wolfmond; Wolfmonat |
| Greek | Δεκέμβρης; Δεκέμβριος |
| Hungarian | december |
| Icelandic | desember |
| Italian | dicembre |
| Jamaican Patois | Disemba |
| Low German | december; decembermånd; kristmånd |
| Luxemburgish | Dezember |
| Malay | bulan Disember; Desember; Disember |
| Norwegian | desember |
| Papiamento | desèmber |
| Polish | grudzień |
| Portuguese | Dezembro |
| Romanian | decembrie |
| Saterland Frisian | Dezember |
| Scots | December |
| Scottish Gaelic | an Dùdlachd |
| Spanish | diciembre |
| Swahili | Desemba |
| Swedish | december |
| Tagalog | Disyembre |
| Thai | ธันวาคม |
| Turkish | aralık |
| West Frisian | desimber; wintermoanne |