trichotomy

noun
tri·​chot·​o·​my | \ trī-ˈkä-tə-mē How to pronounce trichotomy (audio) \
plural trichotomies

Definition of trichotomy

: division into three parts, elements, or classes

First Known Use of trichotomy

1610, in the meaning defined above

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The first known use of trichotomy was in 1610

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