ABSURD, Absurdum, a thing that thwarts, or goes contrary to our common Notions and Apprehensions. See ABSURDITY.

Thus, a Proposition would be absurd, that should affirm, that two and two make five ; or that should deny 'em to make four. See PROSOSITION.

The Logicians have a way of proving the Truth of a Proposition, by shewing the contrary is absurd. See TRUTH.-—
This they call
Reductio ad Absurdum, or arguing ex Absurdo: See REDUCTION.