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From the latin cohaesum, cohesion is the action and the effect to attach or collect things with each other. Cohesion implies some kind of union or link.
Examples: "the coach has highlighted the cohesion of the team in difficult times',"We must show cohesion to overcome adversity", «I do not like this recipe because ingredients have no cohesion», «the candidate to the position of Governor assured that he would work for the cohesion of the entire province.
For Sociology, social cohesion is the feeling of belonging to a common area or the degree of consensus between the members of a community. Depending on the social interaction within the social group, cohesion may be greater or lesser.
An egalitarian and just society will have a high degree of social cohesion since its members are all part of a single group with interests and common needs. However, if the company has a greater inequality, there will be no cohesion and citizens will have conflicting behaviors.
Cohesion between molecules, on the other hand, concerns the forces of attraction and links that are created according to their characteristics. For this purpose (or), forces of attraction, repulsion and membership (among others) must come into play.
Textual cohesion, finally, is the property of the texts which implies that their sentences or fragments are interrelated through elements that establish semantic relationships. The cohesion between sentences allows to organize the text and fitting sense.