This dissertation challenges the traditional idealized model of allomorphy by confronting it with comprehensive data on 15 Russian aspectual prefixes (RAZ-, RAS-, RAZO-, S-, SO-, PERE-, PRE-, VZ-, VOZ-, O-, OB-, OBO-, U-, VY-, IZ-) collected from corpus and linguistic experiments. The traditional definition narrows allomorphy down to a mere variation of form where the meaning remains constant and ...