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Dictionary
English |
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air border
- noun + noun
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MP3
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Definitions |
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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.
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Usage note |
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also used air boundary
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Word family |
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Collocations |
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See also |
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dic_connotations |
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