Linguistics in a narrow sense is always interested in language. The language can be observed from different levels: level of text, sentence and word. These levels in their tern are considered from the viewpoint of pragmatics, semantics, cognitive meaning, syntax, grammar, etc. The word, according to Ferdinand de Saussure, is the smallest speech unit It seems to be nothing confusing with words, as their meanings are given in dictionaries and their syntactical functions are defined even by Aristotle. But we know that language has its dynamic process - it changes in all aspects. With the technical progress and cutting-edge society the language becomes different either in form or in meaning.
Rokhvadze, Roza, "FLARR Pages #67: The Understanding of the Concept FACT in Modern English (The Research is Based on the English-Language Textbooks)" (2009). FLARR Pages. 48.