10
semiannual
5
biennial
5
biyearly
3
half-yearly
3
eighties
2
biannually
2
calendar
2
light-year
2
semi-annual
1
yearly
1
like equinoxes
1
period
1
period of time
1
quarterly
1
quotidian
1
secular
1
semestral
1
semimonthly
1
semiweekly
1
semiyearly
<123>
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APASmart Define. (2015). biannual thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/biannual/thesaurus/synonyms
ChicagoSmart Define. 2015. "biannual thesaurus" https://smartdefine.org/biannual/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, biannual thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/biannual/thesaurus/synonyms>.
MLASmart Define. "biannual thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/biannual/thesaurus/synonyms>