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.
A twist on something existing; a novel difference.
A fault, imperfection or bug especially in a new system or product; typically, they will need to be ironed out.
A small furrow, ridge or crease in an otherwise smooth surface.
A winkle
A line or crease in the skin, especially when caused by age or fatigue.
To develop irreversibly wrinkles; to age.
To make wrinkles in; to cause to have wrinkles.
To pucker or become uneven or irregular.