Synonyms|15Antonyms|0|Broader|0Narrower|0Related|0
1
anniversary
1
bicentennial
1
biennial
1
centennial
1
commemoration
1
jubilee
1
leap year
1
name day
1
natal day
1
sesquicentennial
1
tercentenary
1
triennial
0
eight(adjective, eight)
0
octadic
0
octagonal
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APASmart Define. (2015). octennial thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/octennial/thesaurus/synonyms
ChicagoSmart Define. 2015. "octennial thesaurus" https://smartdefine.org/octennial/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, octennial thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/octennial/thesaurus/synonyms>.
MLASmart Define. "octennial thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/octennial/thesaurus/synonyms>