Where does “millionennium” come from?

millionennium (English) comes from English million, from Middle English milioun, from Middle French million, from Old French millon, from Italian milione, from Italian mille, from Latin Mīlle, from Proto-Italic smīɣeslī.

millionennium (English): a period of time consisting of one million years

Definitions

  1. a period of time consisting of one million years

Ancestry of “millionennium”, step by step

millionennium traces back through two separate lines of ancestry.

via English million

StepLanguageWordMeaning
1EnglishmillionThe cardinal number 1,000,000: 10; a thousand...
2Middle EnglishmiliounThe cardinal number 1 000 000: 106; a thousand thousand
3Middle Frenchmillionmillion, 10
4Old Frenchmillon
5Italianmilionemillion
6Italianmillethousand
7LatinMīllethousand; 1000
8Proto-Italicsmīɣeslīthousand
9Proto-Indo-Europeansmih₂ǵʰéslih₂

via English millennium

StepLanguageWordMeaning
1EnglishmillenniumA period of time consisting of one thousand...
2Late Latinmillenniummillennium
3Latin-enniumforming periods of years
4Latin-ennis
5Latinannusyear; time; season
6Proto-Italicatnosyear
7Proto-Indo-Europeanh₂et-no-
8Proto-Indo-Europeanh₂et-grass
Every word from Proto-Indo-European smih₂ǵʰéslih₂