Single-clause when-defining models in English monolingual pedagogical dictionaries

The paper is concerned with the single-clause when-definition, which is a common folk-defining style that has been established by lexicographers in English monolingual learners’ dictionaries (the Big Five), especially the Longman Dictionary of Contemporary English and Cambridge Advanced Learner’s Dictionary. In brief, the single-clause when-definition format can be applied to explain the meaning of abstract nouns and it closely resembles the double-clause (full-sentence) definition, which can also begin with a subordinating conjunction such as when or if. However, the when-definition does not include the word which is being defined (definiendum) and it is formed out of a single, subordinate clause. This definition-type has received metalexicographers’ attention as it appears to, in general, limit the effectiveness of correct extraction of word class information from abstract noun entries in contrast to the traditional defining model – the analytical definition. In this paper, an attempt is made to investigate two types of single-clause when-defining models: (1) when + personal pronoun; and (2) when + indefinite pronoun (someone/something).1 The collected evidence from the Linear Mixed-effects Modelling analysis indicates that the effect of when-definition  type on syntactic  class  identification  accuracy is statistically significant at the 8% level of significance, with the when + personal pronoun defining style being the superior defining model.