The word "smooth" describes a surface or texture that is even, without roughness or lumps. It can also refer to a process that is easy and free of difficulties or interruptions. In a broader context, "smooth" can describe something that is calm, seamless, or graceful, such as movements or interactions.
The word "smooth" comes from the Old English "smeother," meaning "free from lumps, roughness, or projections," which is related to Old Norse "smjǫðr," meaning "to smear or spread." The origins reflect the idea of a surface that is made to be even or not interrupted.