antisymmetric
adjective
an·ti·sym·met·ric
ˌan-tē-sə-ˈme-trik
ˌan-ˌtī-
: relating to or being a relation (such as "is a subset of") that implies equality of any two quantities for which it holds in both directions
the relation R is antisymmetric if aRb and bRa implies a = b
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Merriam-Webster unabridged
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