IPA: /əˈɡrɛʃən/
KK: /əˈɡrɛʃən/
A type of behavior that is angry or violent, often aimed at hurting someone or something. It can involve starting fights or being hostile.
His aggression towards his opponents was evident during the match.
Aggression is formed from "ad-" (meaning to or toward) and "gressus" (meaning to step or go). The word describes the act of stepping toward someone in a hostile manner, indicating a forceful or violent approach.
Think of 'stepping toward' ('gressus') someone in a hostile way ('ad-') — that's what aggression means.