noun.
In logic, a mnemonic name of a syllogism of the first figure, all whose parts are universal affirmative propositions: as, All men are mortal; all the patriarchs (Enoch, Elijah, etc.) are men; hence, all patriarchs are mortal.
the GNU version of the Collaborative International Dictionary of English
noun.
The first word in certain mnemonic lines which represent the various forms of the syllogism. It indicates a syllogism whose three propositions are universal affirmatives.