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1
many years(expression, time, length)
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APASmart Define. (1970). billion of years thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/billion_of_years/thesaurus/broader
ChicagoSmart Define. 1970. "billion of years thesaurus" https://smartdefine.org/billion_of_years/thesaurus/broader (accessed September 24, 2026).
HarvardSmart Define 1970, billion of years thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/billion_of_years/thesaurus/broader>.
MLASmart Define. "billion of years thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/billion_of_years/thesaurus/broader>