A 'LanguageDesign' is a set of language primitives and standards (i.e. standard libraries, standard optimizations, possibly a standard IDE) that describe a language. A LanguageDesigner must carefully choose PrimitivesAndMeansOfComposition to achieve KeyLanguageFeatures, and must carefully choose standards in order to set community precedents and provide a significant level of out-of-box functionality.
Related: LanguageDesigner, KeyLanguageFeatures, PrimitivesAndMeansOfComposition