The Dictionary of Internal Security

Dictionary

English  
air border - noun + noun MP3
 
Definitions  
Def: an imaginary line that separates countries in the space above the ground
Example: Estonia needs to defend its air border of 1448,6 km.
 
Usage note  
also used air boundary
Word family  
 
Collocations  
 
See also  
 
dic_connotations