17
cyclic(adjective, regular, irregular, routine, erratic)
12
periodic(adjective, usual, regular, irregular, standard)
10
periodical(noun, adjective, regular, irregular, routine)
8
recurrent(adjective, regular, irregular, routine, erratic)
5
intermittent(adjective, regular, limited, irregular, routine)
5
recurring
5
rhythmic
5
seasonable(adjective, appropriate, fitting, timely)
5
summer(adjective, straw-hat)
4
annual
4
autumnal
4
cyclical
3
epochal(adjective, regular, irregular, routine, erratic)
3
isochronal(adjective, regular, irregular, routine, erratic)
3
regular
3
seasonally
3
serial
2
at different times
2
climate
2
even
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APASmart Define. (2015). seasonal thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/seasonal/thesaurus/synonyms
ChicagoSmart Define. 2015. "seasonal thesaurus" https://smartdefine.org/seasonal/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, seasonal thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/seasonal/thesaurus/synonyms>.
MLASmart Define. "seasonal thesaurus" 7 July 2015. Web. 20 September 2026. <https://smartdefine.org/seasonal/thesaurus/synonyms>