pseudonym - name under which an author writes instead of his or her real name, arch-rivals - fiercest competitors , malnutrition - poor, insufficient nutrition , arch-villain - a principal, especially bad person or character, outstay - to stay longer than your host wishes you to stay, neo-imperialism - a modern form of imperialism , atheist - a person who believes there is no God , foretaste - an indication of what is to happen in the future , asymmetrical - not symmetric, irregular , hypertension - very high blood pressure, bicentenary - 200th anniversary or an event , pentagon - five-sided figure , centenary - 100th anniversary of an event , tricolour - flag with three coloured stripes , monotonous - uninteresting, without change , decathlon - athletics contest in which each competitor takes part in ten events , sexagenarian - someone between 59 and 70 years old , quintuplets - five children from one birth , bicameral - parliament with two chambers , quadruplets - four children from one birth , unicorn - mythical animal with one horn, understaffed - not having enough workers, ill-concealed - not hidden well, substandard - not as good as the average, and not acceptable, reinstate - to make something such as a law, system, or rule exist again, defuse - to improve a difficult or dangerous situation, for example by making people less angry or by dealing with the causes of a problem, postgraduate - someone who is studying at a university to get a master's degree or a PhD, precondition - something that must happen or exist before something else can happen, overheat - to become too hot, or to make something too hot, coexist - to exist at the same time or in the same place,

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