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This definition comes from the technical glossary.
The target is the threshold below which a block header hash must be in order for the block to be valid, and nBits is the encoded form of the target threshold as it appears in the block header.
Target — BitcoinV.org Developer Guide
nBits — BitcoinV.org Developer Reference
Target — BitcoinV Wiki
How is the target section of the block header calculated? — BitcoinV StackExchange