確証

プログレッシブ和英中辞典(第4版)

かくしょう【確証】

((give；show)) conclusive evidence; positive proof; (a) confirmation ((of；that))

有罪の確証を握る
secure [obtain] conclusive evidence of his guilt

彼がやったという確証はない
There is no positive proof that he did it.

彼の理論が正しいという確証を得た
The validity of his theory was confirmed.

出典　小学館「プログレッシブ和英中辞典(第4版)」