n.

1. 卷入；纠缠；错综复杂
2. 错综复杂的事物
3. 【数】乘方
4. 【植】退化；内转
5. 【医】（器官的）退化；衰退

n.

1. Physiology  the shrinkage of an organ in old age or when inactive.
2. Mathematics  a function, transformation, or operator that is equal to its inverse.
3. formal the process or state of complication.