defensive strength; defensive ability
Used in games, sports, military contexts, and metaphorically to describe how well someone or something can withstand attacks or pressure.
This equipment has high defensive strength.
We practiced to improve the team's defensive ability.
防御 is the general noun for 'defense', while 防御力 specifically quantifies the strength or capability of that defense.
Compound of 防御 (defense) and 力 (power, strength).