Usually means: One million years; time unit.
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We found 4 dictionaries that define the word megayear:

General (2 matching dictionaries)
  1. megayear: Wiktionary
  2. Megayear: Wikipedia, the Free Encyclopedia

Business (1 matching dictionary)
  1. Megayear: Legal dictionary

Science (1 matching dictionary)
  1. How Many? A Dictionary of Units of Measurement (No longer online)

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Definitions from Wiktionary (megayear)

▸ noun:  A million years, a thousand thousand years.

Similar:
megamillennium, megannum, millionennium, millenium, millenia, majillion, megapenny, miles, megagallon, mileway, more...

Opposite:
microsecond, nanosecond, millisecond

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Similar:
megamillennium, megannum, millionennium, millenium, millenia, majillion, megapenny, miles, megagallon, mileway, more...

Opposite:
microsecond, nanosecond, millisecond



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