| Quinquennium | five-year period lustrum quinquennium |
| Unbiennium | unbiennium |
| Unnilennium | unnilennium |
| Ununennium | ununennium |
| Quinquillion | nonillion |
| Quittenbaum | quince |
| Millennium | millennium |
| Triennium | triennium |
| Einsteinium | einsteinium |
| Ingenium | angel |
| Unununium | unununium |
| Ununbium | ununbium |
| Quinceanera | quinceañera |
| Quinquagesima | Quinquagesima |
| Äquinoktium | equinox |
| Quinkunx | quincunx |
| Quintinus | Quentin Quinten Quinton |
| Quisquilie | bagatelle |
| Ununquadium | ununquadium |
| Famennium | Famennian |