• Happening once in four years.
  • Lasting for four years.
  • Comprising four years: as, a <em>quadrennial</em> period.
  • Occurring once in four years: as, <em>quadrennial</em> elections.
  • A fourth anniversary, or its celebration.
  • Comprising four years.
  • Occurring once in four years, or at the end of every four years.
  • <xref>Happening</xref> every <xref>four</xref> <xref>years</xref>.
  • <xref>Lasting</xref> for four years.
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