Meanings
adjectivepentennial (not comparable)
- not comparablerareSynonym of quinquennial: occurring every five years.
The family had plans to attend the pentennial reunion.
Synonyms: quinquennial
Synonyms & antonyms
adjectiveSynonym of quinquennial: occurring every five years.
Similar
Also see
Origin
- Latinannus“year”
- Ancient Greekπέντε“five”
- Englishpentennial
From Ancient Greek πέντε (pénte, “five”) + Latin annus (“year”) + -ial.
More words from Ancient Greek, Latin
Full word history & related roots →Cite this entry
APA
pentennial. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/pentennial
MLA
“pentennial.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pentennial. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “pentennial,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/pentennial.
Source: pentennial on Wiktionary, CC BY-SA 4.0.