42. injection : 예방접종

43. monocle [mono-, one + oculus, eye] : an eye glass for one eye only/ 외알안경/단안경(單眼鏡)

44. monocycle/ unicycle : 외발 자전거

45. monogamy : the practice or state of being married to only one person/일부일처제

46. monocracy [mono-, one + -cracy, government pattern] : government by one person; autocracy/ 독제정치, 독제체제

47. monocrat/ autocrat :독재자

48. monopoly [mono-, one + pôlein, to sell] : exclusive control of a commodity or service in a given market, or control that makes possible the fixing of prices and the virtual elimination of free competition/ 독점

49. oligopoly [oligos, small + (mono)poly] : control of a commodity or service in a given market by a small number of companies or suppliers/ 과점

50. monotony [mono-, one + -tony, tone] : 
(n) sameness of tone or pitch, or continuance of the same tone without variation/ lack of variation or variety /단조로움(한가지 tone만 있으니 따분하기도 할 겁니다.)

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First uploaded : January 21, 2000 / Last updated : March 7, 2002