Meaning

adjective having or showing determination and energetic pursuit of your ends

adjective tending to spread quickly

adjective characteristic of an enemy or one eager to fight

originEtymology tree Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin ad- Proto-Indo-European *gʰredʰ-der. Latin gradior Latin aggredior Latin aggressuslbor. English aggress Proto-Indo-European *-wós Proto-Indo-European *-iHwósder. Latin -īvus Old French -ifbor. Middle English -yf English -ive English aggressive From aggress + -ive. Compare with French agressif.

Etymology from Wiktionary, CC BY-SA 3.0