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From The Collaborative International Dictionary of English v.0.48:
noninterchangeable \noninterchangeable\ adj. 1. (math, logic) not able to be interchanged without changing the truth value. [WordNet 1.5] 2. Not able to be substituted for each other; -- of objects, such as parts of machinery; as, the ink cartidges on the new printer are noninterchangeable with those on the older model. [PJC]