validity
n. （法律上的）有效，合法，认可；真实性，正确性
例句
We had doubts about the validity of their argument.
我们对他们的论点的正确性有过怀疑。
《牛津词典》
The period of validity of the agreement has expired.
本协议的有效期已过。
It was for the police to assess the validity or otherwise of the evidence.
应由警方来评价证据的有效与否。
《柯林斯英汉双解大词典》
