Definition of "department of defense" []

• The federal department responsible for safeguarding national security of the United States; created in 1947 (noun)

WordNet. Princeton University. 2010.

• "The department of defense, which he characterized as the world's largest consumer of energy, will make one of the "largest commitments to clean energy in history" – with the Navy purchasing enough capacity to power a quarter of a million homes a year."
• "I could prove it if it were not for the fact I am convinced my internet activity is being monitored by the department of defense."
• "He now does consulting work for the department of defense."