|Noah Webster's Dictionary|
1. (v. t.) To make to exist; to make real.
2. (v. t.) To establish the existence or truth of by proof or competent evidence; to verify; as, to substantiate a charge or allegation; to substantiate a declaration.
Substantiate (1 Occurrence)
Acts 25:7 Upon Paul's arrival, the Jews who had come down from Jerusalem stood round him, and brought many grave charges against him which they were unable to substantiate. (WEY)