How to define words and what methods are there?

How to define the term, what are the methods, as follows:

A word is the smallest meaningful language unit that can be used independently. The textbook introduces the method of determining words from four aspects: can you say it alone? If you can say it alone, answer the question alone. It's usually a word, and vice versa.

Expand knowledge:

1, defined structure:

The definition reveals the connotation of the concept, that is, the essential attribute. The general form is: defined concept = (adjacent) generic concept+species difference.

2. Definition method:

Classify the defined concepts appropriately, that is, determine the (adjacent) concepts. Determine the difference between the defined concept and other concepts belonging to the same genus, that is, the difference between species.

3. Defined rules:

The concept awareness of defined items is higher than that of defined items. It is necessary to define unfamiliar concepts with more common concepts. Defined items should be classified correctly. The defined item and the defined item must have the same extension. A defined item cannot directly or indirectly contain a defined item. Definition is generally a positive statement, but it is not impossible to use a negative statement.

4, easy to make logical mistakes in the definition:

Definition of vicious circle. The definition is too wide or too narrow. The definition is obscure, vague or figurative. When you can use the positive form, use the negative form.

5, the structure of division of labor:

Division refers to the logical method of concept extension. There are three elements in division: parent, child and division standard.

6, division method:

Divide classes into subclasses, and divide generic concepts into two concepts.

7. Division rules:

The extended sum of each child must be equal to the parent. The division must be based on the same criteria. The extensions of subitems must be incompatible. Each subitem must be a concept of the same level.

8, divide the logical errors that are easy to make:

The division is incomplete or there are many sub-items. Child compatibility. Incorrect juxtaposition of subitems. The criteria for division are different.

9. Logical methods to clarify the connotation and extension of words:

The connotation of a lexical item refers to the unique or essential attribute of the object it refers to. Usually, the connotation of a word item is clarified by definition. The extension of a term refers to one or a class of objects that the term refers to, that is, the range of objects that the term refers to. Usually, a term is divided according to certain standards to clarify the extension of the term.