We don't have any synonyms for air-defence yet.
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Definition of air-defence:
(n) :
(uncountable) The substance constituting Earth's atmosphere: a gaseous mixture of nitrogen, oxygen, and various trace gases.
(n) :
The substance of the atmosphere seen as an agency of freshness.
(n) :
(uncountable, loosely) The substance of the atmosphere on a planet other than Earth.
(n) :
A breeze; a gentle wind.
(n) :
A feeling or sense.
(n) :
A sense of poise, graciousness, or quality.