13. And that in three ways.
As the ideas men's words stand for are of different sorts, so the way of making known
the ideas they stand for, when there is occasion, is also different. 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.