millennia
n. plural-only C1 Advanced US //məˈɫɛniə// UK //mɪlˈɛniə// mil·len·nia
n. periods of time lasting one thousand years. You use this word when talking about very long stretches of history.
n. plural form of 'millennium'; refers to multiple periods of one thousand years each.
These ancient trees have lived for several millennia.
The landscape has been shaped by the slow movement of glaciers over many millennia.
Archaeologists discovered layers of sediment that had accumulated over millennia, providing a detailed record of how the local climate shifted from lush forest to arid desert.
Usage
The plural form of 'millennium'. Takes a plural verb and is often preceded by 'for' or 'over'.
Pitfall
a millenniaa millenniumMillennia is the plural form; use millennium when referring to a single thousand-year period.