(In Italy) the Italian Social Movement, an extreme right-wing anti-communist political party founded in 1948 (renamed the Alleanza Nazionale (National Alliance) in 1994).
Origin
1950s; earliest use found in American Political Science Review. From Italian M.S.I., initialism from Movimento Sociale Italiano.
Definition of MSI in US English:
MSI
noun
historical
(In Italy) the Italian Social Movement, an extreme right-wing anti-communist political party founded in 1948 (renamed the Alleanza Nazionale (National Alliance) in 1994).
Origin
1950s; earliest use found in American Political Science Review. From Italian M.S.I, initialism from Movimento Sociale Italiano.