[z3c0]

Sort of, yeah. It would be 51% of verification nodes. If you bought 51% of all Bitcoin, but it was verified by everybody else in the network, you don't actually have any power to decide if your transactions were valid or not. If you controlled 51% of the nodes, you would have majority control over which transactions are valid.

[Conjoiner]

it's not 51% of the nodes, it's 51% of the hashing power together with following the agreed upon rules of the network

[z3c0]

You're correct. I oversimplified it quite a bit.