When a group of things or people stick together and work as a unified whole, they're cohesive. A cohesive essay has paragraphs that connect smoothly, each idea flowing naturally into the next. A cohesive team works together seamlessly, with members supporting each other toward a shared goal rather than pulling in different directions.

The word comes from the idea of things holding together, like how water droplets cohere (stick together) to form a larger drop. In writing, a cohesive argument doesn't jump randomly between topics: each sentence builds on the previous one, creating a clear path for readers to follow. In a group project, a cohesive team shares ideas freely, listens to one another, and coordinates their efforts so the final result feels like one unified piece of work, not a jumble of separate parts.

You can think of cohesiveness as the opposite of scattered or fragmented. A cohesive neighborhood has people who know and help each other. A cohesive story has a plot where events connect logically. When something lacks cohesiveness, it feels disjointed, like puzzle pieces that don't quite fit together. When something is truly cohesive, all the parts work together so well that you barely notice the seams.