Logical reasoning was a major concept in Enlightenment
thinking.
View page
Sound reasoning is correct, valid, logical, believable
reasoning.
View page
a logical fallacy
View page
ar·gu·ment, A course of reasoning aimed at demonstrating truth or falsehood: log·i·cal Reasoning or capable of reasoning in a clear and consistent manner. logical argument- a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning; Thesaurus.
By it's definition, it's to separate truth from falsehood or fiction.