Definition of quinary in English:

quinary

adjective

  • 1Fifth in order or rank.

  • 2Zoology
    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.

    • ‘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’.’

Origin

Early 17th century: from Latin quinarius, from quini five at once, a set of five from quinque five.

Pronunciation:

quinary

/ˈkwīˌnerē/