Sergei Diaghilev ser·gei·diag·hilev uncommon noun 1. Russian ballet impresario who founded the Russian ballet and later introduced it to the West (1872-1929) SynonymsDiaghilevSergei DiaghilevSergei Pavlovich Diaghilev Related words Broader terms showman WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.