18 entries under routine topic. ×

17
cyclic(adjective, regular, irregular, erratic)
10
periodical(noun, adjective, regular, irregular)
8
recurrent(adjective, regular, irregular, erratic)
5
intermittent(adjective, regular, limited, irregular)
3
epochal(adjective, regular, irregular, erratic)
3
isochronal(adjective, regular, irregular, erratic)
2
isochronous(adjective, regular, irregular, erratic)
2
occasional(adjective, regular, irregular, infrequent)
1
at various times(expression, adjective, idiom, regular)
1
centennial(adjective, regular, sporadic, intermittent)
1
every once in a while(expression, adjective, idiom, regular)
1
every so often(expression, adjective, idiom, regular)
1
hourly(adjective, regular, sporadic, intermittent)
1
monthly(adjective, regular, sporadic, intermittent)
1
on-again-off-again(adjective, regular, sporadic, intermittent)
1
on certain occasions(expression, adjective, idiom, regular)
1
orbital(adjective, regular, sporadic, intermittent)
1
weekly(adjective, regular, sporadic, intermittent)
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APASmart Define. (2015). seasonal thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/seasonal/thesaurus/synonyms
ChicagoSmart Define. 2015. "seasonal thesaurus" https://smartdefine.org/seasonal/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, seasonal thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/seasonal/thesaurus/synonyms>.
MLASmart Define. "seasonal thesaurus" 7 July 2015. Web. 29 September 2026. <https://smartdefine.org/seasonal/thesaurus/synonyms>