ag ‧ gres ‧ sion /əˈɡreʃ ə n/ BrE AmE noun [uncountable]
[ Date: 1600-1700 ; Language: Latin ; Origin: aggressio , from aggredi 'to attack' , from ad- 'to' + gradi 'to step, go' ]
1 . angry or threatening behaviour or feelings that often result in fighting:
Television violence can encourage aggression in children.
aggression towards
Our dogs have never shown aggression towards other dogs.
2 . the act of attacking a country, especially when that country has not attacked first:
an unprovoked act of aggression
aggression against
Athenian aggression against Persia