(species) (genus) (differentia) (property) (3) A ――――――――― is a ――――――― of ――――――――――――― and ――――――――――――, trigon polygon three sides three angles (accident) ―――――――――――――――――――――――――――――――――――――――――――――――――――――. the sum of the angles being equal to two right angles =3. THE NATURE OF A DEFINITION.= It will be remembered that an individual notion is a notion of a single thing or attribute, while a general notion is a notion of a class of things or a group of attributes. A term which represents an individual notion is known as a _singular term_, while a term which stands for a general notion is referred to as a _general term_. One may explain the meaning of a singular term which stands for one thing by enumerating its various attributes. For example, such attributes as a piercing bark, a yellow color, intelligent, companionable, a strong liking for sweetmeats, explain the meaning of the singular term “Fido.” Likewise we may explain the meaning of a general term by enumerating its attributes. To illustrate: power of speech, rationality, ability to laugh, etc., explain the meaning of the general term _man_. The explanation of the singular term fits only Fido. There is probably no other dog in the world just like Fido. But the explanation of the general term _man_ may be applied to _all_ men. A brief enumeration of attributes which may be applied to a _class of things_ often takes the form of a definition. The word definition comes from the word _definire_, meaning to limit or fix the bounds of. A definition, then, consists of the enumeration of such attributes as distinguish a term from all other terms. In this sense it would seem that the singular term _Fido_, as well as the general term _man_, admits of definition, but it is usual for logicians to confine definition to the _general term_. Singular terms may be _described_; general terms, _defined_. A DEFINITION OF DEFINITION. _A definition of a term is a statement of its meaning by enumerating its characteristic attributes._