Regeneration
Regeneration is a recovery method for some resources, most commonly life and mana. Regeneration gives the appropriate resource a constant recovery per second rate.
It can be gained from equipment, passive skills, or buffs, and can come as flat amounts or as a percentage of the max of that resource. Other modifiers may then multiply that rate.
Regeneration is separate from other recovery methods such as recoup and recharge, and a boost to regneration rate will not affect these other methods.