aggress comes from Latin aggressus, past participle of aggredi ('to approach, attack'), from ad ('to') + gradi ('to step, walk'), from gradus ('step'). Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the verb sense is "to attack or behave aggressively toward another", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as egress, ingress, progress, congress and derivatives such as aggression, aggressive, aggressor, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Latin aggredi, Latin gradi, which anchor the explanation in named linguistic material.