In Case You Are Concerned or Confused by My Use of the Word ‘Mega-annas’ in a Recent Post

I have wanted a useful descriptor word for a period of one million years for some time now, digging as I do into various Earth science subjects which I find interesting and which tend to cover vast periods of time, while having no pretense to being a scientist myself. I should have known that to learn anything worthwhile, you go to the source. Which is of course, the science itself.

You are unlikely to find this word – which is actually mega-annum (singular), i.e. 1 million years, and abbreviated Ma., or any of its derivatives in any classical dictionary, in print or online. And online searches may lead you into places you might prefer not to go. However I did find one useful essay on the subject.

The plural of that term, incidentally, is either mega-annums, which to me sounds quite clumsy, or mega-anna, which does not sound like the plural of anything. I prefer the word ‘mega-annas‘ – which does.

To save you lots of reading, although it is quite an interesting article, I chose a brief summary paragraph from the link I found, listed below…

In summary, the geosciences use the term “mega-annum” rather than “mega-year” for several reasons. The historical development of the field, consistency with the International System of Units, and preservation of precision and meaning all contribute to this choice. By using “mega-annum”, Earth scientists provide clarity, allow for easy conversions between different units of time, and emphasize the vast time scales involved in the study of our planet’s history.

‘Mega-annum vs. Mega-year: Unraveling the Time Terminology of Earth Sciences’ – Geoscience Blog – April 19, 2024

Funnily enough, I had not previously heard of the word mega-year either, it seemingly also being suppressed from normal conversation. I guess people generally have not been taught to think in terms of such long duration. Focused as they tend to be, on their short-term plans or even life-time goals, for which days, weeks, months, years or even decades will suffice. Which may be why they can be easily confused on subjects like ‘climate change’. and led to believe it is something only happening in recent times. We may need to find a short epithet to that effect to place on the gravestone of modern humanity.


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