To show that this assumption is wrong, this paper presents a case study of novel bioeconomics metaphors in an academic marine biology research article (Landa 1998). Novel metaphorical expressions are understudied in traditional approaches to terminology because they behave as sporadic units incapable of structuring whole discourse events. This analysis confirmed that intratextual term variation plays a cognitive and rhetorical function in research articles, helping to construct and transfer knowledge within the text and to realize the communicative purposes of the genre. Furthermore, an examination of the distribution of term variants across text sections revealed three rhetorical functions of term variation: a naming function, present in the title, abstract and keyword sections an explanatory function, in the introduction and discussion sections and a particularizing function, in the method and results sections. Analysis revealed that term variation provides information about the concept’s content and its relationships with other concepts within the conceptual structure. Variants were classified according to the semantic distance from the base term. A semantic analysis of term variation in 19 Spanish-language psychology research articles was carried out. This study explored the behaviour and functions of term variation in research articles in order to better understand the process of knowledge construction within texts.
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