8
tercentennial
7
tercentenary
6
biennial(vegetable, regularity of recurrence periodicity)
6
annual(vegetable, regularity of recurrence periodicity)
5
bimonthly
5
daily
5
diurnal
5
hourly
4
birthday
4
biweekly
4
fortnightly
4
hebdomadal
4
monthly
4
tertian(adjective, regularity of recurrence periodicity)
3
perennial
3
centennial
3
menstrual
3
quotidian
3
secular
3
weekly
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APASmart Define. (2015). triennial thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/triennial/thesaurus/synonyms
ChicagoSmart Define. 2015. "triennial thesaurus" https://smartdefine.org/triennial/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, triennial thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/triennial/thesaurus/synonyms>.
MLASmart Define. "triennial thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/triennial/thesaurus/synonyms>