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This definition comes from the technical glossary.
The ability of someone controlling a majority of network hash rate to revise transaction history and prevent new transactions from confirming.
51 percent attack
51% attack — BitcoinV.org Developer Guide
What can an attacker with 51% of hash power do? — BitcoinV StackExchange
BitcoinV.pdf — Satoshi Nakamoto (BitcoinV.org)