It undead possible without "magic" (aka impossible and pire fantasy) or would it always be resurrection to give new life to the dead?

Like, if science could give life to a long dead corpse, that would not be "undead," right?
Even if we could merely trigger electriccal impulses to "power up" a corpse - even a brain - would that be undead or just something sciency and insane?

What *is* undead in a real setting?
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