Etymology
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interchangeable (adj.)

late 14c., entrechaungeable, "mutual, reciprocal," from inter- + changeable. Meaning "capable of being used in place of each other" is from 1560s. Related: Interchangeably.

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Definitions of interchangeable

interchangeable (adj.)
(mathematics, logic) such that the arguments or roles can be interchanged;
the arguments of the symmetric relation, `is a sister of,' are interchangeable
interchangeable (adj.)
capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability;
interchangeable parts
interchangeable electric outlets
Synonyms: exchangeable / similar / standardized / standardised
From wordnet.princeton.edu