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add root to terminology (#5209) 

* add root to terminology

* review feedback
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Rob Walker 2019-07-22 09:36:20 -07:00 committed by Michael Vines
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commit 2d42c1e33e
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book/src/terminology.md
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@ -91,6 +91,10 @@ History](#proof-of-history).
The time, i.e. number of [slots](#slot), for which a [leader
schedule](#leader-schedule) is valid.
#### finality
When nodes representing 2/3rd of the stake have a common [root](#root).
#### fork
A [ledger](#ledger) derived from common entries but then diverged.
@ -213,6 +217,15 @@ The public key of a [keypair](#keypair).
Storage mining client, stores some part of the ledger enumerated in blocks and
submits storage proofs to the chain. Not a full-node.
#### root
A [block](#block) or [slot](#slot) that has reached maximum [lockout](#lockout)
on a validator. The root is the highest block that is an ancestor of all active
forks on a validator. All ancestor blocks of a root are also transitively a
root. Blocks that are not an ancestor and not a descendant of the root are
excluded from consideration for consensus and can be discarded.
#### runtime
The component of a [fullnode](#fullnode) responsible for [program](#program)