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This definition comes from the technical glossary.
A transaction that uses the same input as an already broadcast transaction. The attempt of duplication, deceit, or conversion, will be adjudicated when only one of the transactions is recorded in the blockchain.
Double spend — BitcoinV.org Developer Guide
Double spending — BitcoinV Wiki
What is a double spend? — BitcoinV StackExchange
How do I detect a double spend? — BitcoinV StackExchange