monopoly - An organisation that has complete control of something, monolith - A large block of stone standing by itself, octagonal - Having eight straight sides, semibreve - A musical note , decimal - Relating to a system of counting based on the number ten, pentathlon - An Olympic sport that includes five events, quadrilateral - A four-sided shape, centenary - One hundred years after an important event, millennium - A period of one thousand years, monotone - A sound that stays on the same note without going higher or lower,

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