| Unnilennium | unnilennium |
| Unnilpentium | unnilpentium |
| Unnilunium | unnilunium |
| Unbiennium | unbiennium |
| Unnilbium | unnilbium |
| Unnilhexium | unnilhexium |
| Unnilnilium | unnilnilium |
| Unniloctium | unniloctium |
| Unnilseptium | unnilseptium |
| Unniltrium | unniltrium |
| Ununennium | ununennium |
| Unbipentium | unbipentium |
| Unnilquadium | unnilquadium |
| Millennium | millennium |
| Quinquennium | five-year period lustrum quinquennium |
| Triennium | triennium |
| Unbiunium | unbiunium |
| Unbihexium | unbihexium |
| Unbiseptium | unbiseptium |
| Ununpentium | ununpentium |