Barbara

A form of syllogism in scholastic logic. The name is from a medieval mnemonic poem, where its vowels reflect the syllogism's standard form of AAA-1. 

All M are P.	A - universal affirmative
All S are M.	A - universal affirmative
Therefore, all S are P.	A - universal affirmative

Unlike some of the other mnemonic terms, barbara is a real Latin word ("barbarous things").

Barbara, Celarent, Darii, Ferio que prioris;
Cesare, Camestres, Festino, Baroko secundae;
Tertia, Darapti, Disamis, Datisi, Felapton,
Bokardo, Ferison, habet; Quarta in super addit
Bramantip, Camenes, Dimaris, Fesapo, Fresison

Bar"ba*ra (?), n. [Coined by logicians.] Logic

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.

Whately.

© Webster 1913.