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Happiness is a sunbeam which may pass through a thousand bosoms without losing a particle of its original ray; nay, when it strikes on a kindred heart, like the converged light on a mirror, it reflects itself with redoubled brightness. It is not perfected till it is shared.
Jane Porter
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Alternative forms



From Middle English smothe, from Old English smēþe (later: smōþ).


smooth (comparative smoother, superlative smoothest)




  1. Having a texture that lacks friction. Not rough.
    • 2005, Lesley Brown, Sophist, original by Plato,  
      Teaching that’s done by talking seems to have one rough path and another part which is smoother.
  2. Without difficulty, problems, or unexpected consequences or incidents.
    We hope for a smooth transition to the new system.
  3. bland; glib
    • 1912, Gustavus Myers, History of the Supreme Court of the United States[1], page 133,  
      This feeling, grounded on the experience of centuries of oppression, was not to be allayed by smooth explanations on the part of the advocates of the Constitution.
  4. (Template loop detected: Template:context 1) suave; sophisticated
    • 2003, T. Lewis Humphrey, The Price of Love[2], ISBN 0595272606, page 279,  
      He was so smooth and handsome. He knew just what to say and when to say it.
  5. (Template loop detected: Template:context 1) natural; unconstrained
    • 2006, Mary Kay Moskal and Camille Blachowicz, Reading for Fluency[3], ISBN 1593852649, page 3,  
      In order for a reading to be smooth and effortless, readers must be able to recognize and read words accurately, automatically, and quickly.
  6. (Template loop detected: Template:context 1) unbroken
    • 1927, United States National Guard Bureau, Manual of Basic Training and Standards of Proficiency for the National Guard[4], page 181,  
      Demonstrate first by the numbers and then as one smooth movement.
  7. (especially Template loop detected: Template:context 1) placid, calm.
    • 1898, John Donaldson Ford, An American Cruiser in the East[5], page 47,  
      As we worked to the southward, we picked up fair weather, and enjoyed smooth seas and pleasant skies.
  8. (Template loop detected: Template:context 1) Lacking projections or indentations; not serrated.
    • 1994, Robert E. Swanson, A Field Guide to the Trees and Shrubs of the Southern Appalachians[6], ISBN 0801845564, page 8,  
      A leaf having a smooth margin, without teeth or indentations of any kind, is called entire.
    • 1997, Christopher Dickey, Innocent Blood: A Novel[7], ISBN 0684842009, page 91,  
      Out of the handles flipped the smooth blade and the serrated blade, which was dangerously sharp, the flathead screwdrivers, the Phillips screwdriver, the can opener, the awl.
  9. (Template loop detected: Template:context 1) Not grainy; having an even texture.
    • 1997, Lou Seibert Pappas, Sorbets and Ice Creams[8], ISBN 0811815730, page 19,  
      A compact and stylish design, it produces 1 generous quart of excellent, smooth ice cream in 20 to 25 minutes.
  10. (Template loop detected: Template:context 1) Having a pleasantly rounded flavor; neither rough nor astringent.
    • 2002, Candace Irvin, For His Eyes Only[9], ISBN 0373079362, page 9,  
      The coffee was smooth, so smooth she took another sip.
  11. (mathematics, Template loop detected: Template:context 1) Having derivatives of all finite orders at all points within the function’s domain.
    • 2003, Eric W. Weisstein, CRC Concise Encyclopedia of Mathematics[10], ISBN 1584883472, page 419,  
      Any ANALYTIC FUNCTION is smooth. But a smooth function is not necessarily analytic.
  12. (linguistics, Template loop detected: Template:context 1) Lacking marked aspiration.
    • 1830, Benjamin Franklin Fisk, A Grammar of the Greek Language[11], page 5,  
      Ου becomes οὐκ before a smooth vowel, and οὐχ before an aspirate.

Derived terms





smooth ({{{1}}})
  1. Something which is smooth or easy.
    • 1860, Anne Manning, The Day of Small Things[12], page 81,  
      Things are often equalized by roughs and smooths being set against one another.
  2. A smoothing action.
    • 2006, Julienne Van Loon, Road Story[13], ISBN 1741146216, page 12,  
      She brushes down her hair with a little bit of spit and a smooth of her hand and opens the bright green door, walking a few metres, squinting.
  3. A domestic animal having a smooth coat.
    • 1916, William Ernest Castle and Sewall Wright, Studies of Inheritance in Guinea-pigs and Rats[14], page 104,  
      In the 4-toe stock there is a wide gap between the lowest rough and the smooths which come from the same parents.
  4. A member of an anti-hippie fashion movement in 1970s Britain.
    • 1999, Peter Childs and Mike Storry, Encyclopedia of Contemporary British Culture[15], ISBN 0806991356, page 188,  
      By the early 1970s, skinhead culture began to mutate into the variant ‘white ethnic’ styles of the suedeheads and smooths.
  5. (statistics) The analysis obtained through a smoothing procedure.
    • 1990, Wolfgang Härdle, Applied Nonparametric Regression[16], ISBN 0521429501, page 17,  
      A smooth of the potato data set has already been given in Figure 1.2.



to smooth

Third person singular

Simple past

Past participle

Present participle

to smooth (third-person singular simple present -, present participle -, simple past and past participle -)
  1. To make smooth.
    • 1961, William Gibson, The Miracle Worker[17], ISBN 0573612382, page 37,  
      She smooths her skirt, looking as composed and ladylike as possible.
  2. (statistics, Template loop detected: Template:context 1) To capture important patterns in the data, while leaving out noise.
    • 1999, Murray R. Spiegel and Larry J. Stephens, Schaum’s Outline of Theory and Problems of Statistics[18], ISBN 0070602816, page 457,  
      [] the 7-month moving averages provide better smoothing of the data in this case than do the 3-month moving averages.

Derived terms


See also

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