runoff

[ruhn-awf, -of]
noun
1.
something that drains or flows off, as rain that flows off from the land in streams.
2.
a final contest held to determine a victor after earlier contests have eliminated the weaker contestants.
3.
a deciding final contest held after one in which there has been no decisive victor, as between two contestants who have tied for first place.
4.
Also called rundown. a continual or prolonged reduction, especially in quantity or supply: a runoff in bank deposits; a sharp runoff in business inventories.
5.
Stock Exchange. the final prices appearing on the ticker after the closing bell is rung for the trading day.

Origin:
1850–55, Americanism; noun use of verb phrase run off; (def 2, 3) see -off

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

runoff

in hydrology, quantity of water discharged in surface streams. Runoff includes not only the waters that travel over the land surface and through channels to reach a stream but also interflow, the water that infiltrates the soil surface and travels by means of gravity toward a stream channel (always above the main groundwater level) and eventually empties into the channel. Runoff also includes groundwater that is discharged into a stream; streamflow that is composed entirely of groundwater is termed base flow, or fair-weather runoff, and it occurs where a stream channel intersects the water table.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The researchers expect less excess nutrients in the runoff as the plants on the
  roof continue to grow.
And our measurements confirm that that stream is contaminated with chemicals
  from runoff from the mine.
Typically, coal companies construct filtration ponds to capture sediments and
  valley-fill runoff.
The only sound was the slow drip of runoff from gutters and rooftops.
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