# Ordering Semantics

> The requirement that a defined semantics specify when one event is considered to happen before another.

Record: `lexicon:ordering-semantics`
Kind: constraint
Layer: [Causality Core](https://banes-lab.com/records/layer/causality-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-ordering-semantics

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Causal Reasoning](https://banes-lab.com/records/lexicon/causal-reasoning.md) and before [Parallel Execution](https://banes-lab.com/records/lexicon/parallel-execution.md).

## Category

- [Causality / Ordering / Distributed Time](https://banes-lab.com/records/lexicon-category/causality-ordering-distributed-time.md)

## Required by

- [Happens-Before Relationship](https://banes-lab.com/records/architecture/happens-before-relationship.md)

## Linked from

- [Causality / Ordering / Distributed Time](https://banes-lab.com/ontology/principles/architecture-category-causality-ordering-distributed-time.md)