(1) a. If X is a horse, X is an ani

(1) a. If X is a horse, X is an animal.
b. If X is a horse, it has a mane.
c. X is a rooster, so X is not a horse.
d. If X is a horse, it is a large four-footed mammal with hooves
and a mane.
As a result, an understanding of definition is necessary for any attempt to
develop a conceptual theory of word meaning. Furthermore, when people
think of a word’s meaning, they are inclined to think of something like its
definition in a dictionary. Since about the sixteenth century, dictionaries
have played an extremely important role in the way we think about and
use our own language, and their existence and popularity can be related
to a complex of pretheoretical ideas about the nature and role of language: a whole linguistic ideology.As a result, it is important to clarify
the similarities and differences between the definitions that might be
proposed in theoretical linguistic semantics, and the types that can be
found in dictionaries.