Things are said to be named 'equivocally' when, though they have a
common name, the definition corresponding with the name differs for
each. Thus, a real man and a figure in a picture can both lay claim to
the name 'animal'; yet these are equivocally so named, for, though
they have a common name, the definition corresponding with the name
differs for each. For should any one define in what sense each is an
animal, his definition in the one case will be appropriate to that
case only.

    On the other hand, things are said to be named 'univocally' which
have both the name and the definition answering to the name in common.
A man and an ox are both 'animal', and these are univocally so
named, inasmuch as not only the name, but also the definition, is
the same in both cases: for if a man should state in what sense each
is an animal, the statement in the one case would be identical with
that in the other.

    Things are said to be named 'derivatively', which derive their
name from some other name, but differ from it in termination. Thus the
grammarian derives his name from the word 'grammar', and the
courageous man from the word 'courage'.