• (a.) Of or pertaining to two hundred, esp. to two hundred years; as, a bicentenary celebration. • (n.) The two hundredth anniversary, or its celebration. Found on http://thinkexist.com/dictionary/meaning/bicentenary/
Bi·cen'te·na·ry adjective [ Prefix bi- + centenary .] Of or pertaining to two hundred, esp. to two hundred years; as, a bicentenary celebration. -- noun The two hundredth anniversary, or its celebration. Found on http://www.encyclo.co.uk/webster/B/47