English ⇄ Chinese Czech Russian

English thesaurus
air defense ['eədɪ'fens]
mil., logist.	Set of measures designed to suppress or limit an enemy air action. (FRA); All actions conducted by specialized units in order to guarantee the freedom of action of the land forces against the enemy's air actions. For the army, these specialized units include the AD artillery and army aviation formations. (FRA)
USA	Defensive measures designed to destroy attacking enemy aircraft or missiles in the atmosphere, or to nullify or reduce the effectiveness of such attack (JP 3-01) see also active air defense, aerospace defense, passive air defense

air: 616 phrases in 36 subjects

Agriculture	45
Agronomy	3
Anatomy	1
Astronomy	16
Biology	1
Building structures	2
Cement	1
Chemistry	10
Commerce	2
Communications	2
Construction	339
Ecology	1
Economy	11
Engineering	2
Entomology	1
Environment	41
Food industry	2
Forestry	9
General	18
Ichthyology	1
Immigration and citizenship	2
International law	2
Meteorology	1
Microscopy	2
Microsoft	1
Municipal planning	1
Natural sciences	1
Obsolete / dated	2
Physics	2
Plumbing	1
Politics	4
Soil science	1
Technology	19
Thermal engineering	1
Transport	61
Ventilation	7