1. 4th Meeting
Definition

2. Definition is the expression of the essence or species of a thing, by means of its proximate genus and specific difference (Juan Jose Sanguineti, Logic, 1982:83) Definition gives the precise answer to the question “What is it?”

3. Kinds of definition
Essential definition: expression of the essential of thing
Example: sport is activity of man
Nominal definition: this expresses, not what a thing is, but what the name means.
Example: Transatlantic is a ship that crosses the Atlantic
Descriptive definition: the definition that gives more notable properties or constitutive parts of something
Example: Water is colorless, ordorless and tasteless substance

4. Genetic definition: the definition how something has been produce
Example: Bronze is an alloy of copper, zinc and tin
Causal definition: the definition that describes a thing by its proper efficient or final cause
Example: Man is a creature whose end is the knowledge and love of God

5. Quality of definition Precise
it is not vague and generic, or figurative
Proper
it is not confused with one of its species. It states the essential attributes of the species
Not circular
It would be incorrect to define: Peace is the absence of war, or war is the absence of peace
Positive
It should not be negative