Full Idea
Dialectic is speech cast in the form of logical argument.
Clarification
'Dialectic' is the impersonal pursuit of truth
Gist of Idea
Dialectic is speech cast in the form of logical argument
Source
M. Tullius Cicero (Academica [c.45 BCE], I.viii.32)
Book Reference
Cicero: 'De Natura Deorum and Academica (XIX)', ed/tr. Rackham,H. [Harvard Loeb 1933], p.443