air defense


Definition of air defense

: the means, techniques, and organizations devoted to preventing or minimizing the effects of attack by enemy aircraft or guided missiles

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of air defense

1916, in the meaning defined above

Learn More About air defense

Time Traveler for air defense

Time Traveler

The first known use of air defense was in 1916

See more words from the same year

Dictionary Entries Near air defense


air defense


See More Nearby Entries 

Statistics for air defense

Cite this Entry

“Air defense.” Dictionary, Merriam-Webster, Accessed 5 Dec. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!