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Dichotomous (adjective)
Dividing or branching into two pieces.
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Dichotomic (adjective)
Choosing between two antithetical choices, between two distinct alternatives. Classification based upon two opposites. [http://www.iop.org/EJ/abstract/0305-4470/27/14/016]
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Dichotomic (adjective)
That system of classification which pertains to two opposite criteria.
Wiktionary
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Dichotomous (adjective)
exhibiting or characterized by dichotomy
“a dichotomous view of the world”
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Dichotomous (adjective)
(of branching) in which the axis is divided into two branches.
Oxford Dictionary