noun
a thing that can be interchanged with something else
adjective
capable of being interchanged or substituted
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In this experiment, the two variables were found to be interchangeable in their effects on the outcome.
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You can use either pen, they're interchangeable.
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I can swap out these shoes for a different pair, they're interchangeable.
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In the world of fashion, trends are constantly evolving and styles become interchangeable over time.