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It means isomorphic in the biology/crystal sense.

Two apps - server & client - that share an extremely similar structure (and code).

It’s not the same as mathematical isomorphism but it’s a perfect description of the dynamics at play if you understand the other meanings of the term.

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It still feels a little like abuse of the (more common) mathematical usage of the term, but the same sort of abuse is ongoing with the term "serverless." These things have moved into developer vernacular, so there's no point fighting it, even if I'm a little biased.

I mean... it’s explicitly not the mathematical usage so that feeling is something you’re bringing to the table, not the users of it.

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