Definition of slavism:
(n) :
(usually uncountable) An attitude, custom, or other feature that is characteristically Slavic.
(n) :
(usually uncountable) Esteem for and emulation of Slavic culture and politics.
(n) :
(countable) A linguistic feature of one or more Slavic languages, especially a Slavic idiom or phrasing that appears in a non-Slavic language.