Cohesion (computer science): a measure of how well the lines of source code within a module work together to provide a specific piece of functionality.
Cohesion (geography): the part of shear strength that is independent of the normal effective stress in mass movements.
Cohesion (linguistics): the linguistic elements that make a discourse semantically coherent.
Cohesion (military): the bonding together of members of an organization/unit in such a way as to sustain their will and commitment to each other, their unit, and the mission (Cohesion the Human Element in Combat, William Henderson, 1985).
Cohesion (music): a Manchester-based four-piece band playing uplifting indie guitar pop.
Cohesion (structural): the sociological and graph theoretical conception and measurement for maximal group or graphical boundaries where related elements cannot be disconnected except by removal of a certain minimal number of other nodes
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Cohesion is the glue that holds a piece of writing together.
In other words, if a paper is cohesive, it sticks together from sentence to sentence and from paragraph to paragraph.
Cohesive devices certainly include transitional words and phrases, such as therefore, furthermore, or for instance, that clarify for readers the relationships among ideas in a piece of writing.