INTERPRETATION OF UNDEFINED TERMS DISPUTES

Introduction

Interpretation of undefined terms disputes arises where a contract, employment policy, collective agreement, statute, regulation or internal rule uses an important word or expression without expressly defining what it means. Examples include terms such as “reasonable,” “senior employee,” “misconduct,” “business necessity,” “temporary transfer,” “performance,” “material breach,” or “suitable alternative employment.”

In South African law, the absence of an express definition does not automatically make a provision invalid or unenforceable. Instead, courts determine meaning through an objective interpretative process based on the language used, surrounding context, purpose of the document and relevant factual background.

Modern Approach to Interpretation

The leading South African approach comes from Natal Joint Municipal Pension Fund v Endumeni Municipality [2012] ZASCA 13. The Supreme Court of Appeal held that interpretation is not confined to dictionary definitions or literal wording. Language must be considered together with grammar, context, purpose and the circumstances surrounding the creation of the document.

This is particularly important for undefined terms. A court first examines how the disputed word operates within the document as a whole. It then considers the purpose of the provision and whether competing interpretations produce commercially or practically sensible outcomes.

However, interpretation cannot become rewriting. Courts cannot insert definitions that the parties or lawmakers did not choose merely because another formulation appears fairer or more convenient.

Ordinary Meaning and Context

An undefined word will commonly begin with its ordinary grammatical meaning, but that meaning is not decisive in isolation. Technical terminology may obtain its meaning from the particular industry, workplace or regulatory framework in which it appears.

For example, an undefined expression such as “suitable position” in a redeployment policy may require consideration of salary, grading, qualifications, location and responsibilities. Similarly, “temporary” may have different consequences depending upon the duration contemplated by the agreement and the overall employment framework.

South African law therefore treats text, context and purpose as interconnected rather than sequential considerations.

Case Name/Citation: Natal Joint Municipal Pension Fund v Endumeni Municipality [2012] ZASCA 13

Facts: A dispute arose regarding the interpretation of pension-fund rules and the financial obligations arising from them.

Legal Issue: How should disputed terminology in a legal document be interpreted where competing meanings are advanced?

Judgment: The Supreme Court of Appeal established the modern contextual approach to interpretation.

Legal Principle/Ratio: Interpretation requires consideration of the wording, grammar, context, apparent purpose and material known when the document was produced. Where several meanings are possible, each must be evaluated against those factors.

Significance: Undefined terms cannot simply be assigned an isolated dictionary meaning. Their legal meaning derives from the entire document and its purpose.

Case Name/Citation: University of Johannesburg v Auckland Park Theological Seminary and Another [2021] ZACC 13

Facts: A dispute arose concerning whether rights under a long-term lease were personal to one party and therefore incapable of being transferred.

Legal Issue: Whether contextual evidence could be considered when interpreting contractual rights even where the written language appeared capable of ordinary interpretation.

Judgment: The Constitutional Court confirmed that context must be considered from the outset, rather than only after ambiguity has been established.

Legal Principle/Ratio: Contractual interpretation is a unitary exercise involving text, context and purpose simultaneously. Relevant background evidence may assist in identifying the nature and meaning of contractual rights, provided it does not impermissibly rewrite the agreement.

Significance: Where an agreement leaves a term undefined, courts may consider its factual and commercial setting in determining what the parties objectively intended.

Resolving Workplace and Policy Disputes

Undefined terminology frequently causes employment disputes. Employers should therefore interpret internal policies consistently with the document's objective, established workplace practice and applicable legislation.

A decision-maker should ordinarily consider:

the natural meaning of the disputed expression;

the provision in which it appears;

related provisions elsewhere in the document;

the document's overall purpose;

relevant legislation and regulatory requirements;

legitimate contextual evidence; and

whether the proposed interpretation creates irrational or unbusinesslike consequences.

Past workplace practice may provide useful contextual evidence, although it cannot automatically override clear contractual wording.

Contra Proferentem

Where genuine ambiguity remains after ordinary interpretative methods have been exhausted, the contra proferentem principle may sometimes support interpreting ambiguity against the party responsible for drafting the provision. It is generally a secondary interpretative aid rather than the starting point.

Conclusion

Interpretation of undefined terms disputes is resolved through a contextual, purposive and text-based analysis. South African law does not require every contractual or policy expression to have an express definition. Courts instead determine meaning objectively by examining the document as a whole, its purpose and relevant surrounding circumstances. Endumeni and University of Johannesburg establish that context is essential from the beginning, while also preserving the fundamental rule that interpretation must clarify the document rather than rewrite it.