11
isochronal(adjective, regular, irregular, routine, joint)
7
periodic(adjective, regular, irregular, repetition, erratic)
7
recurrent(adjective, regular, irregular, routine, repetition)
5
concomitant(adjective, accompanying, contributing, synchronism)
5
concurrent(adjective, synchronism)
5
intermittent(adjective, regular, irregular, routine, erratic)
5
periodical(noun, adjective, regular, irregular, routine)
4
coeval
4
contemporaneous
4
contemporary
4
cyclic(adjective, regular, irregular, routine, repetition)
4
simultaneous(adjective, synchronism)
3
accompanying
3
alternate(adjective, recurrent)
3
coeternal
3
coincident(adjective, synchronism)
3
regular(adjective, recurrent)
2
agreeing
2
at different times
2
chain(adjective, recurrent, wornout, isochronal, summative)
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APASmart Define. (2015). isochronous thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/isochronous/thesaurus/synonyms
ChicagoSmart Define. 2015. "isochronous thesaurus" https://smartdefine.org/isochronous/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, isochronous thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/isochronous/thesaurus/synonyms>.
MLASmart Define. "isochronous thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/isochronous/thesaurus/synonyms>