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Definition
1 : a division into two especially mutually exclusive or contradictory groups or entities
//the dichotomy between theory and practice
also : the process or practice of making such a division
//dichotomy of the population into two opposed classes
2 : something with seemingly contradictory qualities
//it's a dichotomy, this opulent Ritz-style luxury in a place that fronts on a boat harbor
— Jean T. Barrett
3 : the phase of the moon or an inferior planet in which half its disk appears illuminated
4a : BIFURCATION
especially : repeated bifurcation (as of a plant's stem)
b : a system of branching in which the main axis forks repeatedly into two branches
c : branching of an ancestral line into two equal diverging branches
資訊來源：
M-W.com
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