An incision is a careful, deliberate cut made by a surgeon during a medical operation. When doctors need to operate on someone's appendix or repair a broken bone, they make an incision through the skin to reach the area that needs attention. Unlike an accidental cut from broken glass or a kitchen knife, an incision is planned, precise, and made under controlled conditions to help heal someone.

Surgeons spend years learning exactly where and how to make incisions so they heal well and leave minimal scarring. A skilled surgeon considers the size, location, and direction of each incision, choosing the approach that will work best for that particular patient and procedure. Modern surgical techniques have made incisions smaller than ever: some operations that once required large incisions can now be done through tiny cuts barely an inch long.

You might also hear someone describe a comment or criticism as incisive, which means it cuts straight to the heart of an issue with sharp clarity and insight.