What is Capax Doli?

Legal Definition
Capable of committing crime. This is said of one who has sufficient mind and understanding to be made responsible for his actions. See, Discretion.
-- Bouviers Law Dictionary
Legal Definition
Lat Capable of committing crime or capable of criminal intent. The phrase describes the condition of one who has sufficient intelligence and comprehension to be held criminally responsible for his deeds.
-- Black's Law Dictionary