double glazing

noun Building Trades.
glazing consisting of two thicknesses of glass with a dead air space between them.
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World English Dictionary
double glazing
 
n
1.  two panes of glass in a window, fitted to reduce the transmission of heat, sound, etc
2.  the fitting of glass in such a manner

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Even with double glazing, homes with large windows can heat up in hot summer
  months.
Double glazing is a good choice for cold winters, since it entails less heat
  loss and less condensation.
The window on the left is a double glazing with low-E and an insulating spacer.
Advances in window technology such as double glazing and low-e coatings
  substantially reduce heat loss and gains.
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