natural language used by a community of subject specialists in a particular field of knowledge, formalised and codified variety of language, used for special purposes with the function of communicating information of a specialist nature at any level in the most economic, precise and unambiguous terms possible, language used in a subject field and characterized by the use of specific linguistic means of expression, mingil erialal kasutatav keel, millele on omane spetsiifiliste keeleliste väljendusvahendite kasutamine, kirjakeele allkeel teaduse, kunsti, tehnika jm alade tarbeks