n.[U][C]

1. 变化；转变；变形；变质
   There was a noticeable transformation in his appearance.

   他的容貌有了明显的变化。

2. 【电】变换，转换
3. 【数】变换（式）
4. 【核】转换
5. 【语】转换
6. 【生】变态，转化
7. （女人用的）假发

n.

1. a marked change in nature, form, or appearance.
2. Mathematics  & Logic  a process by which a figure, expression, or function is converted into another one of similar value.
3. Linguistics  a process by which an element in the underlying logical deep structure of a sentence is converted to an element in the surface structure.
4. Biology  the transfer of genetic information between different species of bacteria, especially by a plasmid.