2 Zoology, historical Relating to or denoting a former system of classification in which the animal kingdom is divided into five subkingdoms, and each subkingdom into five classes.
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- When Darwin read that an opponent of the ‘quinary’ system was proposing a modification to sets of four, he expostulated in his notebooks, ‘Anyone may believe anything in such rigmarole about analogies and numbers’.
early 17th century: from Latin quinarius, from quini 'five at once, a set of five', from quinque 'five'.
More definitions of quinaryDefinition of quinary in:
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