Definify.com
Webster 1913 Edition
Triennial
Tri-en′ni-al
,Adj.
1.
Continuing three years;
as,
. triennial
parliaments; a triennial
reignHowell.
2.
Happening, coming about, or appearing once in every three years;
as,
triennial
elections; a triennial
catalogue; a triennial
visitation. T. Warton.
Tri-en′ni-al
,Noun.
Something which takes place or appears once in three years.
Webster 1828 Edition
Triennial
TRIEN'NIAL
,Adj.
1.
Continuing three years; as triennial parliaments.2.
Happening every three years; as triennial elections. Triennial elections and parliaments were established in England in 1695; but these were discontinued in 1717, and septennial elections and parliaments were adopted, which still continue.