| age(noun, time, set, informal, round) | |
| aeon(noun, set, group, round, age) | |
| time(noun, age) | |
| era(noun, set, round, period, history) | |
| eternity(noun, time) | |
| cycle(noun, time, set, age, sequence) | |
| epoch(noun, age) | |
| generation(noun, age, era) | |
| period(noun, set, group, round, age) | |
| ages(noun, age) | |
| long time(expression, idiom) | |
| day | |
| duration(noun, age) | |
| year(noun, time) | |
| date | |
| long(noun, time) | |
| years(noun, age) | |
| amount | |
| annum | |
| annus magnus |
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| APA | Smart Define. (2015). eon thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/eon/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "eon thesaurus" https://smartdefine.org/eon/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, eon thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/eon/thesaurus/synonyms>. |
| MLA | Smart Define. "eon thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/eon/thesaurus/synonyms> |