air defense

noun

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

Keep scrolling for more

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

Statistics for air defense

Cite this Entry

“Air defense.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20defense. Accessed 30 Nov. 2020.

Comments on air defense

What made you want to look up air defense? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

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