Finality is a property of transactions on a blockchain. An (absolutely) 'final' transaction could not be changed (altered, reduced, cancelled, etc.) All transactions on a blockchain fall short of this ideal, possessing greater or lesser 'finality' in the sense that there is a higher probability that the block a transaction is executed through will remain included on the blockchain (and not orphaned) the deeper in the chain the block is. While the question of 'time to finality' is relevant to certain use cases, such times will turn on the notion of a transaction being 'secure enough,' settled as much by relevant conventions as by a network's metrics. See also 'confirmation time.'