Definition of dichotomy noun from the Oxford Advanced Learner's Dictionary

 

dichotomy

 noun
noun
BrE BrE//daɪˈkɒtəmi//
 
; NAmE NAmE//daɪˈkɑːtəmi//
 
[usually singular](pl. dichotomies)
 
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dichotomy (between A and B) (formal) the separation that exists between two groups or things that are completely opposite to and different from each other Word Origin late 16th cent.: via modern Latin from Greek dikhotomia, from dikho- ‘in two, apart’ + -tomia ‘cutting’, from temnein ‘to cut’.
See the Oxford Advanced American Dictionary entry: dichotomy