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Glossary

This chapter provides comprehensive definitions of key terms and concepts used throughout the growth investing guide. Each entry explains the term precisely and provides context for how the concept applies to evaluating growth companies. Understanding this terminology is essential for reading financial statements, analyst reports, and company guidance with sophistication.

The glossary includes fundamental metrics used in growth investing analysis—such as Rule of 40, ARR, NRR, and ROIC—alongside more specialized concepts like compounding, network effects, and moats. It also covers business model terminology, valuation metrics, and the frameworks that distinguish high-quality growth companies from those merely riding temporary momentum. Refer back to this chapter whenever you encounter unfamiliar terms or need to clarify the precise definition of a concept.

Why Terminology Matters​

Clear understanding of terminology prevents confusion and ensures you're evaluating companies using consistent definitions. This is particularly important when comparing companies across different industries or reviewing historical analyses where terminology may have evolved. Two investors using different definitions of "profitability" might reach opposite conclusions about the same company's financial health.

Growth investing discourse uses specific terminology precisely because the distinctions matter. The difference between organic growth and total growth, between ROIC and WACC, between Rule of 40 scores and Rule of 50 scores—these distinctions determine how you evaluate investment opportunities. Professional investors speak a specific language because that language enables precise communication about companies and market dynamics.

When you encounter a term like "CAC payback" or "net revenue retention" or "operating leverage," these aren't arbitrary financial jargon. Each term describes a specific economic concept with real implications for company valuation and risk assessment. Understanding what each term means—precisely—separates sophisticated investors from those who merely repeat phrases without comprehension.

Using the Glossary​

You can use this glossary in multiple ways. Read it cover-to-cover to establish baseline vocabulary before diving into case studies or valuation frameworks. Return to it whenever you encounter unfamiliar terms in company filings or analyst reports. Use it to clarify distinctions between related concepts—understanding the difference between TAM, SAM, and SOM, or between customer acquisition cost and payback period, prevents analytical errors that compound throughout valuation work.

The glossary also serves as a reference for understanding how professional investors discuss growth companies. By internalizing this terminology, you develop fluency in growth investing discourse and can consume investment research, company earnings calls, and peer analysis with greater comprehension.

Organization and Accessibility​

Each entry in this glossary is alphabetically organized for quick reference. Terms are defined concisely but comprehensively—we explain not just what each term means but why it matters for growth investors. Many entries include cross-references to related concepts, helping you understand how different metrics and frameworks interconnect.

Some terms are fundamental—growth rate, revenue, profit margin—building blocks that underpin all analysis. Others are specialized—net revenue retention, Rule of 40, CAC payback—specific to evaluating technology and software businesses. Still others are frameworks—competitive moat, network effect, profitability runway—that shape how you think about companies and industries.

Building Your Vocabulary​

Growth investing requires mastery of financial and operational terminology. The more precisely you understand each term, the more effectively you can analyze companies and communicate your investment theses to others. Investors who confuse gross margin with operating margin, or who misunderstand the difference between ROIC and ROE, make analytical errors that lead to poor investment decisions.

This glossary is not meant to be memorized but rather referred to continuously throughout your growth investing studies. As you encounter terms in case studies, frameworks, or company filings, return here to clarify meaning and understand context. Over time, this terminology becomes internalized—you stop thinking about what "Rule of 40" means and start immediately understanding the business implications of a company's score.

The goal is fluency: the ability to read a company's financials, understand an analyst's thesis, or discuss investment ideas using precise, professional terminology. That fluency enables better analysis and better investment decisions.

Articles in this chapter​