Usually means: One billion years, time unit.
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We found 6 dictionaries that define the word gigayear:

General (2 matching dictionaries)
  1. gigayear: Wiktionary
  2. Gigayear: Wikipedia, the Free Encyclopedia

Business (2 matching dictionaries)
  1. Gigayear: Legal dictionary
  2. Gigayear: Financial dictionary

Computing (1 matching dictionary)
  1. Gigayear: Encyclopedia

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

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Definitions from Wiktionary (gigayear)

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

Similar:
giga-annum, gigaannum, gigalightyear, gigabyte, gigameter, gigametre, gigabit, gigabuck, gajillion, gigabel, more...

Opposite:
picosecond, nanosecond, microsecond, millisecond, second

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Similar:
giga-annum, gigaannum, gigalightyear, gigabyte, gigameter, gigametre, gigabit, gigabuck, gajillion, gigabel, more...

Opposite:
picosecond, nanosecond, microsecond, millisecond, second



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