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.


14. In Simple Ideas, either by synonymous terms, or by showing examples.

I. First, when a man makes use of the name of any simple idea, which
he perceives is not understood, or is in danger to be mistaken, he is
obliged, by the laws of ingenuity and the end of speech, to declare his
meaning, and make known what idea he makes it stand for. This, as
has been shown, cannot be done by definition: and therefore, when a
synonymous word fails to do it, there is but one of these ways left.
First, Sometimes the NAMING the subject wherein that simple idea is
to be found, will make its name to be understood by those who are
acquainted with that subject, and know it by that name. So to make a
countryman understand what FEUILLEMORTE colour signifies, it may suffice
to tell him, it is the colour of withered leaves falling in autumn.
Secondly, but the only sure way of making known the signification of the
name of any simple idea, is BY PRESENTING TO HIS SENSES THAT SUBJECT
WHICH MAY PRODUCE IT IN HIS MIND, and make him actually have the idea
that word stands for.


15. In mixed Modes, by Definition.

II. Secondly, Mixed modes, especially those belonging to morality, being
most of them such combinations of ideas as the mind puts together of its