Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: aggressio, from aggredi 'to attack', from ad- 'to' + gradi 'to step, go'

aggression

noun
     
ag‧gres‧sion [uncountable]
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

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