meaning - Understanding dichotomy



I am having a hard time understanding the definition of dichotomy.


I saw this recent article from a Harvard student: "• Dichotomy means two mutually exclusive alternatives and does not mean difference or discrepancy. Correct: There is a dichotomy between even and odd numbers."


Does that support the Oxford Dictionary's definition?


"Division or contrast between two things that are or are represented as being opposed or entirely different:"


I'm just completely confused, now.




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