bicentenary	200th anniversary
pentagon	five-sided figure, pieciokąt
centenary	100th anniversary/event
tricolour	with three colours
monotonous	uninteresting, without change
decathlon	athletic contest in wich each competitor takes part in 10 events
sexagenarian	someone between 59-70 yo
quintuplets	five children from one birth
bisect	cut/divide into two parts
cent	one hundredth of a dollar
biplane	aircraft with two pairs of wings
bicameral	parliament with two chambers
unicycle	cycle with one wheel
quadruplets	four children from one birth
unicorn	mythical animal with one horn