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1. (of the skin) free from hair
2. not harsh or astringent
3. Maths (of a curve) differentiable at every point
4. Physics (of a plane, surface, etc.) regarded as being frictionless
5. Tennis squash badminton the side of a racket on which the binding strings form a continuous line
Comparatively calm water between heavy seas.
To modify a sequential set of numerical data items in a manner designed to reduce the differences in value between adjacent items.