القياس الجدلي قياس مركب من مقدمات مشهورة أو مسلمة عند الخصم، صادقة كانت أو كاذبة.
A dialectical syllogism is composed of premises that are widely accepted or conceded by the opponent, whether actually true or false.
The definition turns on two features: the acceptance or concession of the premises, and the fact that acceptance does not itself establish their truth. The argument is called dialectical because of its premises' standing in discussion.