Causal Definitions and Their Types

A causal definition clarifies the meaning or intension of a term by identifying the cause that produces the reality signified by the term.

Efficient Cause: This refers to the agent that enables something to happen or brings about the reality.
- Example: The efficient cause of pneumonia is the pneumococcus virus.
Material Cause: This refers to what constitutes the thing itself.
- Example: Water is defined as H2O, representing both its material and formal aspects.
Formal Cause: This describes how the material of the thing is organized or structured.
Final Cause: This refers to the end goal or purpose of a thing.

Descriptive Definition: Lists the characteristics necessary for categorizing a species.
Definition by Example: Provides data for the definition rather than a straightforward definition itself.
Grammatical/Nominal Definitions:
- Nominal Definition: The act of naming something.
- Etymology: The historical breakdown of the word.
- Definition by Synonym: Providing a synonym to explain the term.
Arbitrary Definition: Considers whether there is a consensus regarding the meanings of words.

Convertibility: Definitions should be convertible with their subject; they must accurately reflect what they define.
Positivity: Definitions should inform what something is, rather than what it is not.
Clarity: Definitions must utilize clear language that is neither obscure, vague, ambiguous, nor figurative.
Avoidance of Redundancy: Definitions should not use words with the same root as the word being defined.
Structural Consistency: Definitions should be symbolized by a parallel, not mixed, grammatical structure.