Correct

定性

/ dìngxìng /
Strokes

Definition

to determine the nature (usually of error or crime)/to determine chemical composition/qualitative/fixed

Example

As a Verb

determine/decide the nature (of a case, etc)

1
shìjiàn
事件
zǎo
早已
dìngxìng
定性
  

The nature of the incident has long been decided.

As a Verb

determine/analyse the chemical composition of a substance