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﹒Consisting of or relating to four parts or elements.
﹒The most recent geological period in the Cenozoic era, spanning from 2.58 million years ago to the present.
﹒Fourth in a series or order.
﹒The quaternary period is the most recent geological time frame, spanning from 2.58 million years ago to the present.
﹒In chemistry, a quaternary ammonium compound is often used as a disinfectant or surfactant.
﹒The quaternary structure of a protein refers to the arrangement of multiple folded polypeptide chains into a single functional complex.
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