In a manner that permits exchange; in a way that allows substitution or mutual replacement.
From 'exchangeable' + -ly (adverb-forming suffix). The -ly suffix converts adjectives into adverbs describing how something is done or the manner of action.
When we say currencies are 'exchangeably' linked to gold, or organs are 'exchangeably' transplantable, we're describing a symmetry that physics and mathematics recognize as deeply elegant—things that flow freely in either direction.
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