the property of a material that permits it to endure or resist exposure to the weather.

1945–50; weather + -ability Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
weather (ˈwɛðə)
1.  a.  Compare climate the day-to-day meteorological conditions, esp temperature, cloudiness, and rainfall, affecting a specific place
 b.  (modifier) relating to the forecasting of weather: a weather ship
2.  a prevailing state or condition
3.  make heavy weather
 a.  (of a vessel) to roll and pitch in heavy seas
 b.  (foll by of) to carry out with great difficulty or unnecessarily great effort
4.  informal under the weather
 a.  not in good health
 b.  intoxicated
5.  (prenominal) Compare lee on or at the side or part towards the wind; windward: the weather anchor
vb (when intr, foll by through)
6.  to expose or be exposed to the action of the weather
7.  to undergo or cause to undergo changes, such as discoloration, due to the action of the weather
8.  (intr) to withstand the action of the weather
9.  to endure (a crisis, danger, etc)
10.  (tr) to slope (a surface, such as a roof, sill, etc) so as to throw rainwater clear
11.  (tr) to sail to the windward of: to weather a point
[Old English weder; related to Old Saxon wedar, Old High German wetar, Old Norse vethr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Energy characteristics of outdoor and indoor exposure sources and their
  relation to the weatherability of plastics.
Look at the long-term weatherability of the plastics to determine their outdoor
It provides faster drying time, higher film builds than traditional
  polyurethanes, and high-quality weatherability.
Its chemical resistance, weatherability, and resistance to salt spray also are
  important to its use in plastics.
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