Mega-annum

//ˌmɛɡəˈænəm// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Synonym of megayear: a period of 1 million years.

    "Holonyms: petasecond < giga-annum, gigayear < exasecond"

Synonyms

All synonyms
megayearmillionennium

Example

More examples

"Holonyms: petasecond < giga-annum, gigayear < exasecond"

Etymology

From mega- + annum.

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