It seems you're asking about "defanation" of matter, which is not a standard scientific term. It's likely a misspelling of "defamation" or "deformation" of matter.

Let's break down the possible meanings:

* Defamation: This refers to damaging someone's reputation through false statements. It doesn't apply to matter.

* Deformation: This refers to the change in shape or size of an object due to applied forces. This is a valid concept in physics and material science.

If you were referring to deformation of matter, it's a fundamental concept in physics and material science. Here are some key points:

* Types of deformation: Deformation can be elastic (the material returns to its original shape after the force is removed) or plastic (the material permanently deforms).

* Factors influencing deformation: The type of material, the magnitude of the force, and the duration of the force all play a role in how a material deforms.

* Applications: Understanding deformation is crucial in designing structures, machines, and materials for various applications.

Please clarify your question if you meant something different. Let me know if you'd like to learn more about deformation!