The way to define an antonym is based on （）.

The way to define an antonym is based on （）.
A、contradiction
B、contrariness
C、oppositeness
D、relativeness
【正确答案】：C
【题目解析】：Antonyms are classified on the basis of semantic opposition. 反义词是按语义相反的情况进行划分的。答案为C。