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"Regeneration" (more commonly dubbed a "Healing Factor") is a term applied to those who can heal wounds at an accelerated rate, far exceeding that of humans.
The lowest levels are basic wounds like cuts or scrapes that would normally take weeks to heal being healed in days, hours, minutes or even seconds. The higher levels go into regenerating entire limbs, vaporization, complete physical destruction and even complete conceptual destruction at the highest levels.
Low: Faster healing ability for normal wounds. In machines and vehicles, this would be regenerating basic exterior damage.
Mid-Low: Able to heal wounds that would normally leave large scars. In machines and vehicles, this would be regenerating damage that would normally leave large dents and openings.
High-Low: Able to regenerate some severed body parts like fingers, arms, legs. In machines and vehicles, this would be regenerating some interior damage, and some minor critically damaged or destroyed parts.
Low-Mid: Able to regenerate limbs/fatal wounds. Still die from decapitation. In machines and vehicles, this would be regenerating minor parts and more extensive internal damage.
Mid: Able to regenerate from decapitation. In machines and vehicles, this would be regenerating from the destruction of critical parts such as the engine.
High-Mid: Able to regenerate from being blown into pieces.
Low-High: Able to regenerate from a puddle/drop of blood, or a small piece of your body.
Mid-High: Able to regenerate from being vaporized/dust.
High: Able to regenerate from a single molecule/atom/particle.
Low-Godly: Able to regenerate as long as your disembodied consciousness exists; regenerate from other realms.
Mid-Godly: Able to regenerate from nothing.
High-Godly: Able to regenerate even if your existence is erased and the reality you are within is destroyed.
True Godly: Able to regenerate even if you are erased from both existence and nonexistence.
NOTE: To qualify for True Godly regeneration, a character must be able to regenerate from being erased from the duality of both existence and nonexistence, whereas it is only necessary to be able to recover from the former in order to warrant a High-Godly rating.NOTE #2: 1-A entities (beings beyond the concepts of dimensions) always have High-Godly regeneration (given that they are above existence per definition), but they are not automatically the highest rating. In order to qualify, such beings must also have displayed the capacity to recover from complete Outerversal destruction, or be logically capable of doing so.