MedGen

A language disorder characterized by difficulty in language acquisition despite otherwise normal development and in the absence of any obvious explanatory factors. [from MONDO]

A severe form of developmental verbal apraxia with characteristics of a deficit in spontaneous speech, writing, grammatical judgment and repetition, defective articulation, moderate to severe degree of dyspraxia, a reduced use of consonant clusters and comprehension delay. Hearing and intelligence are normal. Inheritance is autosomal dominant with full penetrance. [from SNOMEDCT_US]

Language impairment is a deficit in comprehension or production of language that includes reduced vocabulary, limited sentence structure, or impairments in written or spoken communication. Language abilities are substantially and quantifiably below age expectations. [from HPO]

A disorder characterized by an individual''s inability to comprehend or share ideas or feelings because of an impairment in language, speech, or hearing. [from NCI]

Specific language impairment (SLI) is a common developmental disorder characterized by difficulty in language acquisition despite otherwise normal development and in the absence of any obvious explanatory factors (summary by Newbury et al., 2009). Genetic Heterogeneity of Specific Language Impairment Multiple loci for specific language impairment have been mapped, including SLI1 on chromosome 16q; SLI2 (606712) on chromosome 19q; SLI3 (607134) on chromosome 13q21; SLI4 (612514) on chromosome 7q35-36; and SLI5 (615432), caused by mutation in the TM4SF20 gene (615404) on chromosome 2q36. [from OMIM]