syllogisticadj.n.

1669 T. Gale Court of Gentiles: Pt. I i. ii. §14 The more simple mode of philosophizing by Dialogues,..which was the main Logic used in al the Grecian..Scholes, before Aristotle brought in the syllogistic forme of Mode and Figure.

1678 R. Cudworth True Intellect. Syst. Universe i. v. 770 To put the Argument into a more Approveable Syllogistick Form, Whatsoever is Extended, is Body, or Corporeal; But Whatsoever Is, is Extended. Therefore Whatsoever Is, is Body, or Corporeal. And by Consequence there can be no Incorporeal Deity.

1697 tr. F. Burgersdijck Monitio Logica ii. vi. 22 The Syllogistick Form is only an apt Disposition of the three Propositions for the necessary Collection of a Conclusion from the Premises.

1751 S. Johnson Rambler No. 152. ⁋10 If a disputed position is to be established, or a remote principle to be investigated, he may detail his reasonings with all the nicety of syllogistic method.

1821 Aldrich's Artis Logicæ Rudim. (ed. 2) 110 The harshness and apparent tautology of the formal syllogism has been one occasion of prejudice against the syllogistic system.

1855 H. Spencer Princ. Psychol. ii. vi. 138 We pass from the ordinary so-called syllogistic reasoning, to what is commonly known as reasoning by analogy.

1867 T. Fowler Elem. Deduct. Logic iii. iii. 90 We shall first enumerate and explain certain syllogistic rules (derived from the definition of a syllogism) which will exclude illegitimate moods.

1833 W. Hamilton in Edinb. Rev. Apr. 206 Dr. Whately makes the process of reasoning not merely its [sc. logic's] principal, but even its adequate object;..In this view logic is made convertible with syllogistic.

1837 T. Carlyle French Revol. III. ii. v. 127 The rest,..welter amid Law of Nations, Social Contract, Juristics, Syllogistics.

1847 W. Hamilton Let. to De Morgan 3 The principle of Syllogistic, afforded by the quantification—the expressed quantity—of the predicate.