quadrennial

• quadriennial

Borrowed from Latin quadriennium (“four-year period”), from quattuor (“four”) + annus (“year”); surface analysis quadr- +‎ -ennial.

• (UK) IPA^(key): /ˌkwɒˈdɹɛn.i.əl/
• (US) IPA^(key): /ˌkwɑˈdɹɛni.əl/
• Rhymes: -ɑdɹɛnɪəl

quadrennial (not comparable)

1. Happening every four years.

   1852, Millard Fillmore, State of the Union Address

   The quadrennial election of Chief Magistrate has passed off with less than the usual excitement.

2. Lasting for four years.

• quadrennially

• triennial
• biennial
• perennial
• annual

quadrennial (plural quadrennials)

1. A four-year period.