The 3 Rules of a Perfect Definition: Jami' and Mani' explained

Is Your Definition Valid? The Rules of Jami' and Mani'

In our previous discussion on Hadd and Rasm, we learned the types of definitions. But how do we know if a definition is actually good? In Ilm al-Mantiq, there are strict laws to ensure a definition is "water-tight."

The Golden Standard: Jami' Mani'

A successful definition must act like a filter. It must let in everything that belongs and keep out everything that doesn't. This is summarized in two famous Arabic terms:

1. Jami' (Inclusive)

The definition must gather all individuals of the thing being defined. If you define a "Bird" as "an animal that flies," your definition is not Jami' because it leaves out ostriches and penguins.

2. Mani' (Exclusive)

The definition must prevent other things from entering. If you define a "Human" as "a living being that walks on two legs," your definition is not Mani' because it allows chickens and kangaroos to enter the definition.

3 Prohibited Mistakes in Definitions

To keep your logic sharp, avoid these three common errors:

• Circularity (Ad-Dawr): Defining a word using the word itself.
  Example: "Logic is the science of being logical." This adds no new knowledge.
• Using Obscure Language: A definition should be clearer than the thing being defined. Don't use "big words" to explain a simple concept.
• Using Figurative Language: In Mantiq, we avoid metaphors. Don't define "Knowledge" as "A sun that rises in the heart." While poetic, it isn't a logical definition.

The Next Step: From Concepts to Propositions

Now that we have mastered the art of defining concepts, we are ready to move to the second big pillar of Mantiq: At-Tasdiqat (Propositions). This is where we learn how to build sentences that can be proven true or false.

Is your favorite definition Jami' and Mani'? Test it out in the comments below!

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