Definition of quinquennial in English:

quinquennial

adjective

  • 1Recurring every five years.

    • ‘We know that the system we have under the quinquennial census allows people to make and nominate what ethnicity they might be - and it is a curious thing; I think that few other countries have such a system.’
    • ‘For a fraction of the expense of the proposed quinquennial review two better options are open to the General Medical Council.’
    1. 1.1Lasting for or relating to a period of five years.
      • ‘Thereafter came praetorship and consulship (though not all achieved these offices), and finally the quinquennial office of censor, the crown of a republican politician's career.’

Origin

Late 15th century (in the sense lasting five years): from Latin quinquennis (from quinque five + annus year) + -al.

Pronunciation:

quinquennial

/kwiNGˈkwenēəl/