Definitions from Wiktionary ( )

▸ adjective:  Having a texture that lacks friction. Not rough.
▸ adjective:  Without difficulty, problems, or unexpected consequences or incidents.
▸ adjective:  Bland; glib.
▸ adjective:  Flowing or uttered without check, obstruction, or hesitation; not harsh; fluent.
▸ adjective:  Suave; sophisticated.
▸ adjective:  (of an action) Natural; unconstrained.
▸ adjective:  (of a motion) Unbroken.
▸ adjective:  (chiefly of water) Placid, calm.
▸ adjective:  (of an edge) Lacking projections or indentations; not serrated.
▸ adjective:  (of food or drink) Not grainy; having an even texture.
▸ adjective:  (of a beverage) Having a pleasantly rounded flavor; neither rough nor astringent.
▸ adjective:  (mathematics, of a function) Having derivatives of all finite orders at all points within the function’s domain.
▸ adjective:  (mathematics, of a number) That factors completely into small prime numbers.
▸ adjective:  (linguistics, classical studies, of a vowel) Lacking marked aspiration.
▸ adjective:  (of muscles, medicine) Involuntary and non-striated.
▸ adverb:  Smoothly.
▸ noun:  Something that is smooth, or that goes smoothly and easily.
▸ noun:  A smoothing action.
▸ noun:  A domestic animal having a smooth coat.
▸ noun:  A member of an anti-hippie fashion movement in 1970s Britain.
▸ noun:  (statistics) The analysis obtained through a smoothing procedure.
▸ verb:  (transitive) To make smooth or even.
▸ verb:  (transitive) To reduce to a particular shape or form by pressure; to press, to flatten.
▸ verb:  (transitive) To make straightforward or easy.
▸ verb:  (transitive) To calm or palliate.
▸ verb:  (statistics, image processing, digital audio) To capture important patterns in the data, while leaving out noise.
▸ verb:  (West Country) To stroke; especially to stroke an animal's fur.

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