Word.ws English Dictionary

megaannum

/ˌmɛɡəˈænəm/

megaannum is the alternative spelling of mega-annum.

Meaning of mega-annum

Noun

mega-annum (plural mega-annums or mega-anna)

  1. Synonym of megayear: a period of 1 million years.
    • Holonyms: petasecond < giga-annum, gigayear < exasecond
    Synonyms:
    megayear

Forms of megaannum

pluralmegaannums
pluralmegaanna

Origin of megaannum

From mega- + annum.

Questions about megaannum

What is megaannum the alternative spelling of?
Megaannum is the alternative spelling of mega-annum.
How do you pronounce megaannum?
Megaannum is pronounced /ˌmɛɡəˈænəm/.

Words near megaannum in the dictionary

  1. mega-watts
  2. megaamp
  3. megaampere
  4. megaamperes
  5. megaamps
  6. megaannum
  7. megabacteria
  8. megabacterial
  9. megabacterium
  10. megabad
  11. megaband

Source and license

Adapted from Wiktionary: megaannum (page history and authors); mega-annum (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “megaannum.” Word.ws, https://word.ws/megaannum. Based on Wiktionary, CC BY-SA 4.0.