Definition: Meaning of, Department of Defense, the in English to English dictionary.
Pronunciation:/ ɒv;(ə)v dɪˈfɛns ðə;ðɪ;ðiː /
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the US government department which is responsible for the military forces in the US, that is, the Army, Navy, Air Force, and Marines. In the UK there is a similar department called the MINISTRY OF DEFENCE .