Number of blocks between the target block and the first block (genesis block). Each confirmation increases the networks block height by 1.
1.1 Bitcoin (BTC)
The current block height of the Bitcoin (BTC) chain is in the 500,000s, with a new block being added roughly every 10 minutes and increasing the block height by 1.
Activation of features or changes to the blockchain usually activate at specific block heights.
The block reward halvenings happen at pre-determined block-heights around 4 years apart
When BCH upgrades the features activate at pre-determined block-heights such that the network stays in sync.
The total number of blocks confirmed on a blockchain.
* All terms and definitions may update as the Cryptionary improves.