Answer: millennia

AnswerCrossword Clue
MILLENNIA1000-year periods
MILLENNIAMost of us have lived in two of them
MILLENNIAEon parts
MILLENNIAThousands of years
MILLENNIABig anniversaries
millenniaA period of a thousand years, esp. when calculated from the traditional date of the birth of Jesus Christ
millenniaA utopian period of good government, great happiness, and prosperity
millenniaAn anniversary of a thousand years
millenniaMILLENNIUM, (Latin) a period of one thousand years
millenniaThe prophesied thousand-year reign of Christ at the end of the age (Rev. 20:1รป5)
millenniaThe point at which one period of a thousand years ends and another begins