正確性的英語有validity、correctness。
validity是指（法律上的）有效，合法，認可；真實性，正確性。
例句
（1）We had doubts about the validity of their argument.
我們對他們的論點的正確性有過懷疑。
（2）The question is not regarding the validity of speciation.
這個問題與物種形成論的正確性無關。
correctness正確性
例句
（1）The correctness of this decision may be doubted.
此項決定是否正確值得懷疑。
（2）A suggested explanation, so long as its correctness is still in doubt, is called a hypothesis.
提出來的解釋，只要它的正確性仍然有疑問，便稱為假說。