Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
approval [əˈpruːvəl] n одобре́ние; (permission) согла́сие
to meet with sb's approval получа́ть (получи́ть*perf) чьё-н одобре́ние
on approval (COMM) на про́бу
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.