A period of 1,000 years or the start of the year 2000.
Examples:
The art exhibit celebrated the millennium with futuristic designs.Scientists predict technological leaps in the next millennium.Many cultures have myths about a golden millennium of prosperity.
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Antonyms:
Century
/ˈsentʃəri/
A period of one hundred years.
Examples:
The church was built in the 13th century.As though we were living in different worlds, in different centuries.It was a poem of centuries.
Synonyms:
Antonyms:
This word has no antonyms
Ways to tell them apart:
A millennium contains ten centuries, so it's much longer.
Remember that mille in millennium is similar to a thousand, hinting at 1000 years.
A century is shorter, just 100 years, easily remembered as a cent in century is like a century or hundred.
Millennium is used when talking about grand spans of time, think of it as a huge milestone.
Century usually refers to more manageable chunks of history or time, think of changes within a century.