Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
signify [ˈsɪgnɪfaɪ] vt (subj, sign, gesture etc) означа́ть (impf) (:person) выража́ть (вы́разить*perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.