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>'What's the definition of a blade?'

I'm not sure there's any hard and fast definition.

Generally, a blade is going to share power at least, likely network uplinks as well. Diskless configurations are common, with some sort of shared storage being used, but local disk is finding its way back into blades via SSD.

Making diskless servers work is too complex for most admins, so blades are generally sold with disks. Blades are generally cable-less and share power, cooling, and networking within the chassis.

To me a blade is a server that you have to have a blade chassis in order to use it.