Quadriennial
"Quadriennial" in a Sentence (1 examples)
It is now imperative that this improvement is a continuing process, not a series of cautious tri- or quadriennial steps, interspersed by protracted passenger surveys, financial re-appraisals and deliberation in endless committees.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.