# Transactions Content type: Topic Hub Related resources: - Atomic Transaction (Glossary Term): https://theblockchainlibrary.com/glossary/atomic-transaction - FIFO Transaction Ordering (Glossary Term): https://theblockchainlibrary.com/glossary/fifo-transaction-ordering - Meta-Transaction (Glossary Term): https://theblockchainlibrary.com/glossary/meta-transaction - Nonce (Glossary Term): https://theblockchainlibrary.com/glossary/nonce - Transaction Hash (Glossary Term): https://theblockchainlibrary.com/glossary/transaction-hash
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Transactions

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7 Glossary Terms
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Key Glossary Terms

Essential vocabulary for this topic

Atomic Transaction

intermediate

A transaction or set of operations that either completes entirely or leaves no partial state changes.

FIFO Transaction Ordering

advanced

A transaction-ordering policy that processes eligible transactions in first-in, first-out order rather than primarily by fee bidding.

Meta-Transaction

advanced

A pattern where a user signs an instruction off-chain and another account submits the corresponding on-chain transaction.

Nonce

intermediate

A sequence value used to distinguish transactions and prevent certain replay attacks.

Transaction Hash

beginner

A cryptographic identifier derived from a blockchain transaction and commonly used to locate it in an explorer.

Transaction Ordering

advanced

The rules or mechanism determining the sequence in which pending transactions are included and executed.