有别于一般语境中的词汇同义关系，特殊语境下涌现的同义词更有创造力，其同义关系呈现不确定性。在特定语境下理解词汇同义关系时，其同义词时常呈现涌现特征，这一特征无法通过语义联系理论进行阐释。本文以关联理论模型为出发点，结合认知心理学特殊范畴概念，探究词汇同义关系的认知前提和机制。研究指出，词汇同义关系的构建是词汇百科信息与语境假设互动的产物，其涌现特征由会话双方通过语用推理机制在具体语境下推导而来。

Compared to lexical synonymy in general context, the synonyms generated in specific context are often more creative and indeterminate. The interpretation of lexical synonymy in particular context often results in the emergent properties of its synonyms. This feature cannot be explained by semantic associative account. Combined with the concept of ad hoc category in cognitive psychology, this paper explores the cognitive premise and mechanism of lexical synonymy using the framework of relevance theory. We propose that the construction of lexical synonymy is the result of the mutual adjustments of the encyclopedic information and contextual assumption. This paper argues that the emergent property of lexical synonymy is inferred by the interlocutors in specific context through pragmatic inferential mechanism.