# duality
## Noun (N)
### Sense: being twofold; a classification into two opposed parts or subclasses
- การแบ่งเป็นสองกลุ่ม
- ทวิวิภาค
### Sense: (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
- ทวิภาวะ