7
synchronous(adjective, concurrent)
4
simultaneous
3
concurrent
3
contemporaneous(adjective, concurrent)
3
parallel
3
synchronal
3
synchronic
2
coetaneous
2
coeval
2
coexistent
2
coexisting
2
coincident
2
coincidental
2
contemporary
1
coinciding
1
cooccurring
1
synchronised
1
synchronized
0
at the same time(expression, idiom, separate)
0
circumstantial
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APASmart Define. (2016). asynchronous thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/asynchronous/thesaurus/antonyms
ChicagoSmart Define. 2016. "asynchronous thesaurus" https://smartdefine.org/asynchronous/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2016, asynchronous thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/asynchronous/thesaurus/antonyms>.
MLASmart Define. "asynchronous thesaurus" 10 March 2016. Web. 20 September 2026. <https://smartdefine.org/asynchronous/thesaurus/antonyms>