Block Chain Height, Block Height
This definition comes from the technical glossary.
Definition
The number of blocks preceding a particular block on a block chain. For example, the genesis block has a height of zero because zero block preceded it.
Synonyms
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    Height 
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    Block height 
Links
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    Block height — Developer Guide 
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    Definition of block height — Bitcoin StackExchange 
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    Why is block height required in the coinbase? — Bitcoin StackExchange 
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    Is block height always sequencial? — Bitcoin StackExchange