Learner's definition of REASONING
1 : the process of thinking about something in a logical way in order to form a conclusion or judgment
Could you explain your reasoning?
They told everyone the reasoning behind the decision.
a conclusion based on fallacious/flawed/false/sound reasoning
a method/mode/pattern of reasoning
She chose to follow a particular line of reasoning. [=she chose to use a specific set of reasons in order to reach a conclusion]
2 : the ability of the mind to think and understand things in a logical way