biennium

Etymology
From, from + , from  + , q.v.

Noun

 * 1) A period of two years, particularly for purposes involving intercalation or fiscal calculations.
 * °N, °W

Translations

 * Galician: bienio
 * Greek:
 * Latin: biennium
 * Polish: dwulecie
 * Spanish:
 * Turkish: iki yıl

Etymology 1
From, from + , q.v.

Etymology 2
Regularly declined forms of.