What does aggression mean?
Aggression is a noun describing hostile, violent, or forceful behavior directed at others, ranging from physical attacks to verbal hostility and confrontational attitudes. It appears across several domains: in everyday speech it covers hostile conduct between people; in psychology it names behaviors intended to cause harm; in international law it refers specifically to an armed attack by one state against another, as in 'an act of aggression.' The word can also carry a positive connotation in contexts like sports or business, where 'aggression' may describe commendable drive, intensity, or competitive spirit rather than hostility. Derived forms include the adjective 'aggressive,' the adverb 'aggressively,' and the noun 'aggressor' for one who attacks. Because its meaning shifts with context — condemnatory in law and psychology, sometimes admiring in athletics — aggression is a versatile word whose tone depends heavily on the situation in which it is used.
Hostile or violent behavior or attitudes toward another person; readiness to attack or confront.
"His sudden aggression startled everyone in the room."
In psychological contexts, aggression can be physical or verbal and need not involve actual violence.
The action of attacking a country without provocation, especially in violation of international law.
"The United Nations condemned the invasion as an act of aggression."
This diplomatic and legal sense is narrower and more formal than the general behavioral sense.
The plural is rare and mostly confined to formal or legal writing referring to multiple separate acts of aggression.
"The report documented a series of border aggressions over the past decade."
In international law, 'aggression' is such a serious charge that defining it took the United Nations decades — and it remains one of the few crimes that can trigger global intervention.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aggression
Aggression derives from the Latin verb 'aggredi,' meaning 'to attack' or 'to approach,' formed from 'ad-' (toward) plus 'gradi' (to step or go). It entered English in the early 17th century, initially carrying the sense of an unprovoked attack, particularly in political and military contexts. The word shares its Latin root with related terms such as 'aggressive,' 'aggressor,' and, more distantly, words built on 'gradi' like 'progression' and 'congress.'
Related word forms
How aggression is actually used
Aggression is primarily a formal-to-neutral term common in psychology, sports commentary, journalism, and international law. In psychology it carries a technical sense covering hostile or instrumental harmful behavior; in diplomacy and law it denotes an unlawful attack by one state on another. When used approvingly — as in sports or business — it usually implies vigor and competitiveness rather than hostility.
Easily confused with aggression
Aggressiveness refers to a personality trait or disposition to be assertive or forceful, while aggression typically denotes hostile behavior or an act of attack itself.