For though DEFINING be thought the proper way to make known the proper signification of words; yet there are some words that will not be defined, as there are others whose precise meaning cannot be made known but by definition: and perhaps a third, which partake somewhat of both the other, as we shall see in the names of simple ideas, modes, and substances.
Zeren nahiz eta hitzen esanahi propioa adierazteko bide egokia definizioa dela uste den, badira hitz batzuk definitu ezin direnak, beste batzuen esanahia, berriz, definizioz baino ezagutu ezin den artean, eta hirugarren batzuk, ordea, aipaturiko bietatik zerbait dutenak dira, ideia bakunen, moduen eta substantzien izenetan ikusiko dugun moduan.