What does it mean for a feature to be recessed?

A feature being recessed means it is set back from the surrounding surface. This configuration allows the feature to be embedded or placed inward compared to the level of the surrounding material. This is often done for functional or aesthetic purposes, such as when creating pockets that house components or providing space for bolt heads to sit below the surface plane.

In contrast, being raised above the surface would describe a protruding feature, while being flush means the feature does not extend beyond the surface level, lying level with it. Reinforcement externally refers to adding material around a feature to enhance its strength or durability, which does not align with the definition of a recessed feature. Therefore, understanding the term "recessed" directly supports recognizing its contextual application in metal cutting practices and machining designs.