Which term denotes a relation between elements that can be substituted for one another at a particular position in a structure?

• A. Paradigmatic relations
• B. Syntagmatic relations
• C. Semantic fields
• D. Morphological patterns

Answer: (A)

Paradigmatic relations capture the idea that elements occupying the same slot in a structure can be substituted for one another. This is the vertical axis of a linguistic paradigm: the set of possible items that can appear in that position forms a related group, showing what could occur there without changing the function of the structure. Syntagmatic relations describe how elements line up in sequence along a chain—what comes before or after—rather than what can replace another item in the same spot. Semantic fields are about related meanings and lexical domains, not about positional substitution. Morphological patterns refer to word-form changes and affixation, not to interchangeable items at a single position. So the term that denotes substitution at a particular position is paradigmatic relations.