| Part of speech | common noun |
|---|---|
| Plural | halfleeftye |
| Catalan | període de semidesintegració |
|---|---|
| Czech | poločas přeměny |
| Danish | halveringstid |
| Dutch | halfwaardetijd; halveringsperiode; halveringstijd |
| English | half‐life |
| Esperanto | duoniĝa tempo |
| Finnish | puoliintumisaika |
| French | demi‐vie |
| German | Halbwertszeit |
| Greek | χρόνος ημιζωής |
| Hungarian | felezési idő |
| Icelandic | helmingunartími |
| Italian | emivita |
| Malay | separuh hayat; waktu paruh |
| Norwegian | halveringstid |
| Romanian | meia‐vida |
| Russian | период полураспада |
| Spanish | período de semidesintegración |
| Swedish | halveringstid |
| Thai | ครึ่งชีวิต |
| Turkish | yarılanma süresi |
| Welsh | hanner oes |