agency
[an organization that is part of a larger group] UNICEF is an agency of the United Nations.
aggression
[(1) an attack against a person or country; (2) the violation of a country's borders]
The surprise attack was an act of aggression. (1)
The country committed aggression when it crossed the border of the other country. (2)
ago
[(1) of time past; (2) before now]
He was my friend long ago. (1)
I saw her two years ago. (2)
agree
[(1) to have the same belief as someone; (2) to be willing to do something]
We agree about politics. (1)
Both sides agree to meet again next week. (2)
agriculture