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Noun: gigayear
  1. (cosmology) one billion (10^9) years
    "the universe is approximately 14 gigayears old"

Encyclopedia: Gigayear

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gigacycle per second
gigaelectron volt
gigaflop
gigahertz
gigantic
gigantically
gigantism
gigaparsec
Gigartinaceae
gigawatt
gigayear
giggle
giggler
giggly
GIGO
gigolo
gigot
gigue
Gikuyu
Gila
Gila Desert