Fifteen children (grades 3-5) with specific language impairment (SLI) were asked to define 10 common nouns. Children with SLI scored significantly lower than children with typically developing language for both content and form. Results suggest that lexical access and/or lack of metalinguistic knowledge were potential causes for the lower scores…

This study examined qualitative developments in 96 school-aged children's expressible knowledge of 434 words (selected to represent dictionary contents). Developmental changes were found in proportions of high quality definitions, semantic and syntactic form, effects of parts of speech, morphological composition, and lexical organization. Results…