Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
realization [rɪəlaɪˈzeɪʃən] n (understanding) осозна́ние; (fulfilment, of hopes) осуществле́ние; (of asset) реализа́ция
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.