Glossary

Taxonomy Term	Synonym	block.one Definition
Account		An on-chain identifier made up of native and/or custom permissions that are assigned one or more keys or accounts.
Authority		An abstract of permissions that represent how permissions are organized in reality that are bound to an individual or groups of individuals
Block	Blk	A confirmable unit of the Blockchain. Each block contains zero or more Transactions, as well as a cryptographic connection to all prior blocks. When a block becomes "irreversibly confirmed" it's because a supermajority of Block Producers have agreed that the given Block contains correct Transactions. Once a Block is irreversibly confirmed, it becomes a permanent part of the immutable Blockchain.
DAC		Decentralized Autonomous Collective, or Decentralized Autonomous Corporation. Described in detail here (need link).
DAO		Decentralized Autonomous Organization.
DPoS		Delegated Proof of Stake. Also, "Democracy as Proof of Stake." DPoS is one of a collection of consensus algorithms, i.e. methods by which block producers can agree (reach consensus) on which transactions and which blocks are "real" and should be confirmed and treated as irreversible.
Key pair	keys	A public key and its corresponding private key
larimer		1/10000 of an EOS (token) 0.0001 EOS
Master Password		The password used to to unlock (decrypt) a wallet file
Message	Msg	A change to the Blockchain. One or more messages make up a Transaction.
Oracle		"An oracle, in the context of blockchains and smart contracts, is an agent that finds and verifies real-world occurrences and submits this information to a blockchain to be used by smart contracts." Source
Permission		A weighted security mechanism that determines whether or not a message is properly authorized by evaluating its signature(s) authority
Private Key		A secret key used to sign transactions
Public Key	pub key	A publicly available key that is transmitted alongside a transaction
Smart Contract		A smart contract is a computer protocol intended to facilitate, verify, or enforce the negotiation or performance of a contract.
Transaction	Tx, Txn	A complete all-or-nothing change to the Blockchain. A combination of one or more Messages. Usually, the execution of a Smart Contract.
Wallet		An encrypted file generated and/or managed by a client (for example, eosc) that manages private keys and facilitates the signing of transactions in a secure manner. Wallets may be in a locked or unlocked state.
Witness	block producer	The node that is currently taking its turn producing the "right now" block for the blockchain. Or, a member of the group of nodes who have been elected to take such turns. Synonymous with 'block producer'