| microsecond | |
| millennium | |
| millisecond | |
| moment | |
| moon | |
| quinquennium(noun, period) | |
| semester | |
| sennight(noun, time, period, archaic) | |
| weekday | |
| academic year | |
| fortnight | |
| leap year(expression, idiom, regularity of recurrence periodicity) | |
| period of time(expression, idiom) | |
| septet | |
| workweek | |
| abundant year | |
| allotment | |
| annum | |
| bissextile year | |
| bit |
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| APA | Smart Define. (2015). week thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/week/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "week thesaurus" https://smartdefine.org/week/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, week thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/week/thesaurus/synonyms>. |
| MLA | Smart Define. "week thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/week/thesaurus/synonyms> |