Definition of "airspace" []

• The portion of the atmosphere above a particular land area, especially that of a political subdivision such as a nation. (noun)
• The space occupied by an aircraft. (noun)
• A designated sector of space, such as that in the vicinity of an airport. (noun)
• Chiefly British Space available for broadcasting within a particular frequency: "Mobile radio has to compete for air space with other services such as broadcast radio, television, and even military services” ( Financial Times). (noun)
• See airtime. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "On an average day within Canada and the United States, there are about 200,000 domestic flights, with another 1,500 flights inbound from overseas areas, so you can appreciate that surveillance of our airspace is an enormous task."
• "A no-fly zone is defined as airspace in which certain aircraft - especially military ones - are forbidden to fly."
• "And a country's airspace is part of that nation, she said, invoking various international conventions."