Quinquennial
QUINQUEN'NIAL, adjective [Latin quinquennalis, quinquennis; quinque, five, and annus, year.] Occurring once in five years, or lasting five years.
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QUINQUEN'NIAL, adjective [Latin quinquennalis, quinquennis; quinque, five, and annus, year.] Occurring once in five years, or lasting five years.