An Etymological Dictionary of Astronomy and Astrophysics

1. To support or establish the certainty or validity of; verify.
   
   

2. To establish the truth, accuracy, validity, or genuineness of.

Etymology (EN): L. confirmare “make firm, establish,” from → com- intensive prefix + firmare “to strengthen,” from firmus, → firm.

Etymology (PE): Âdešidan, from prefix a- + deš “→ firm” + infinitive suffix -idan.