1. Comprising four years; as, a quadrennial period.
2. Occurring once in four years, or at the end of every four years; as, quadrennial games.
QUADRENNIALLY
Quad*ren"ni*al*ly, adv.
Defn: Once in four years.
QUADRENNIUM
Quad*ren"ni*um, n. Etym: [NL. See Quadrennial.]
Defn: A space or period of four years.
QUADRI-
Quad"ri-. Etym: [L., from quattuor four. See Four.]
Defn: A combining form meaning four, four times, fourfold; as, quadricapsular, having four capsules.
QUADRIBASIC
Quad`ri*ba"sic, a. Etym: [Quadri- + basic.] (Chem.)
Defn: Same as Tetrabasic.