Bienniums is a 9 letter English word. It's valid Scrabble word worth 12 points. It's valid Words with friends word worth 17 points.
You can make 207 anagrams from letters in bienniums (beiimnnsu).
1895-1900; Latin, equivalent to bi- bi-1 + -enn- (combining form of annus year) + -ium -ium
This has been used and the library has therefore had this biennium, $9,000 a year.