- attosecond
- century
- day
- decade
- femtosecond
- fortnight
- hour
- leap year
- mean year
- microsecond
- millennium
- millisecond
- minute
- month
- nanosecond
- novennial
- octennial
- picosecond
- quindecennial
- quinquennial
- second
- septennial
- shake
- sidereal day
- sidereal hour
- sidereal year
- synodic month
- tropical year
- week
- year