Lexical cohesion refers to the way in which words and phrases in a text are connected through their meanings and relationships, contributing to the overall coherence and unity of discourse. This form of cohesion is achieved through various techniques such as the repetition of words, the use of synonyms, antonyms, and collocations, which help to reinforce the thematic elements of a text. By creating connections between terms, lexical cohesion enhances the reader's understanding and engagement with the material.