Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

Sometimes we may pass from quality to definition, as in actions concerned with lunacy, cruelty and offences against the State. In such cases if it is impossible to assert that the acts alleged were right, we are left with such pleas as,

To use bad language to one's wife does not amount to cruelty.

Definition is the statement of the fact called in question in appropriate, clear and concise language.

As I have already said, [*](V. x. 55.) it consists mainly in the statement of genus, species, difference and property. For example, if you wish to define a horse (for I will take a familiar example), the genus is animal, the species mortal, the diffrence irrational (since man also is mortal) and the properly neighing. Definition is employed by the orator for a number of different reasons.