dichotomy (n.)

• abscission
• ambiguity
• ambivalence
• amputation
• bifurcation
• bisection
• branching
• butchering
• cleavage
• conjugation
• cutting
• division
• doublethink
• doubling
• dualism
• duality
• duplication
• duplicity
• enucleation
• excision
• fission
• forking
• irony
• laceration
• mutilation
• pairing
• polarity
• ramification
• resection
• ripping
• scission
• section
• severance
• slicing
• splitting
• subdivision
• surgery
• tearing