triennium (concise oxford English dictionary)
meeting
Another name for a male rabbit is "Buck".
Another name for deep gorge is canyon or ravine.
Another name for mercury is quicksilver.
Another name of a dog house is a kennel.
"Another name for decade, is 10 years. there is another name does anyone no what it is ==decennium
The answer is tercentenary or tercentennial depending on whether you need a noun or an adjective.
Wanax was another name for a Mycenaean
menstruation
Another name for a group on the Periodic Table is a column.
Archaic Period Classical Period Hellenistic Period
period
A "period".
The year.
A period on the Periodic Table is another name for the row that an element is on.
150 millions years ago Earth was in the late Jurassic period.
It has no individual name