To cut one or more grooves in (the ground, etc.).
To wrinkle.
To pull one's brows or eyebrows together due to concentration, worry, etc.
A trench cut in the soil, as when plowed in order to plant a crop.
Any trench, channel, or groove, as in wood or metal.
A deep wrinkle in the skin of the face, especially on the forehead.
The highest order of derivative (the differentiability class) over a given domain.
The condition of being smooth; the degree or measure of said condition.
The quantity measured by the modulus of smoothness.