---
ref_id: REF-23
ref_type: Companion
ref_index: 23
shortcode: Lexicon
name: PMI Lexicon of Project Management Terms (5th ed.)
status: Active
version: "1.0.0"
file_path: "reference/companion-references/REF-23.md"
pmbok8_source: "PMBOK8 Guide §Glossary · Standard §Glossary"
last_updated: "2026-06-03"
---

# REF-23 — PMI Lexicon of Project Management Terms (5th ed.)
**Shortcode:** Lexicon  
**Publisher:** Project Management Institute (PMI), 2024  
**Authority:** PMBOK8 Companion — Canonical PM Terminology  
**Version:** 1.0.0 · **Status:** Active

## Full Bibliographic Citation
Project Management Institute. (2024). *PMI Lexicon of Project Management Terms* (5th ed.). Project Management Institute. Official release: https://www.pmi.org/standards/lexicon

## What This Reference Adds Beyond PMBOK 8
The PMI Lexicon is the authoritative, edition-neutral glossary of project management terms across all PMI standards. Where PMBOK 8 provides a glossary limited to terms used within PMBOK 8 itself, the Lexicon covers terms across the entire PMI standards library — providing canonical definitions, disambiguation of similar terms, and cross-standard consistency. It is the reference of record when a term appears in multiple PMI documents with slightly different usage.

## PMBOK 8 Domain and Principle Coverage

| PMBOK 8 Element | Lexicon Contribution |
|---|---|
| PMBOK8 Guide Glossary | Extends and disambiguates all PMBOK 8 glossary terms with cross-standard context |
| All Performance Domains | Provides canonical definitions for domain-specific terminology |
| All Principles | Provides canonical definitions for principle-related concepts |

## PMOSkills Artifact and Skill Connections

| Item | Connection |
|---|---|
| reference/GLOSSARY.md | The PMOSkills Glossary is harmonized with the PMI Lexicon as its external authority |
| All skill files | Term definitions in skill files must be consistent with the Lexicon |
| All process records | Process and artifact terminology must align with Lexicon canonical definitions |

## Practitioner Usage Notes
- When a term's meaning is disputed or ambiguous, the Lexicon provides the PMI authoritative definition.
- For AI agents: the Lexicon is the disambiguation authority when processing PMI terminology across skills and process records.

---
*Authority: PMI Lexicon of Project Management Terms 5th ed. (2024) · PMBOK8 Glossary*  
*Repository: https://github.com/fakhruldeen/PMOSkills*
