What does "millionennium" mean?

Synonym of mega-annum: a period of time consisting of one million years.

What is a synonym for "millionennium"?

Common synonyms include: mega-annum, megayear.

Millionennium

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
Synonym of mega-annum: a period of time consisting of one million years. rare
"Holonym: eternity"

Synonyms

All synonyms

mega-annum megayear

Example

More examples

"Meronyms: annum, biennium, triennium, quadrennium, quinquennium, sexennium, septennium, octennium, novennium, decennium, vicennium, tricennium, centennium, quincentennium, millennium, decamillennium, centimillennium"

Etymology

Blend of million + millennium.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.