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years on end(expression, idiom)
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century
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distance
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extension
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extent
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footage
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length
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linear measures
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longitude
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longness
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right smart spell(expression, idiom)
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aeons ago(noun, expression, eternity)
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blue moon(noun, time)
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constantly
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disciplined
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esp.eon
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far
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for a long time(expression, idiom)
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forever and a day(expression, idiom, years)
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forever and ever(expression, idiom, years)
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APASmart Define. (2015). long time thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/long_time/thesaurus/synonyms
ChicagoSmart Define. 2015. "long time thesaurus" https://smartdefine.org/long_time/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, long time thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/long_time/thesaurus/synonyms>.
MLASmart Define. "long time thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/long_time/thesaurus/synonyms>