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Adjective: interchangeable  ,in-tu(r)'cheyn-ju-bul
  1. (mathematics, logic) such that the arguments or roles can be interchanged
    "the arguments of the symmetric relation, 'is a sister of,' are interchangeable"
  2. Capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
    "interchangeable parts";
    - exchangeable, similar, standardized, standardised [Brit]

See also: replaceable, symmetric, symmetrical

Encyclopedia: Interchangeable