Able to be switched with another thing without making any important difference; functionally the same in a given situation.
From 'interchange' (to exchange each with the other) + '-able'. 'Interchange' comes from 'inter-' (between) + 'change'.
When two things are interchangeable, the system cares about the role, not the individual piece. It’s efficient for machines and parts—but when people feel interchangeable, it can quietly drain meaning and motivation.
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