1rare The presence, involvement, or partnership of many countries or nationalities.
2South African historical An apartheid policy which regarded the population of South Africa as a number of distinct ‘nations’ which should eventually be geographically and politically separated from each other. Compare "separate development".
The practice or policy of operating in several or many countries.
1940s; earliest use found in Annals of the American Academy of Political and Social Science. From multinational + -ism.