a message received and understood
knowledge acquired through study or experience or instruction
(military) military action or resources protecting a country against potential enemies
(sports) the team that is trying to prevent the other team from scoring
the justification for some act or belief
the federal department responsible for safeguarding national security of the United States; created in 1947
an administrative unit of government
a business that serves other businesses
the state of being in action or exerting power
