cohesion UK /kəʊˈhiː.ʒən/US /koʊˈhi.ʒən/ noun5 •State of cohering, or of working together.Unit cohesion is important in the military. •Various intermolecular forces that hold solids and liquids together. •Growing together of normally distinct parts of a plant. •Degree to which functionally related elements in a system belong together. •Grammatical or lexical relationship between different parts of the same text. formscohesions