Etymology
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marginalization (n.)

"act or fact of making marginal" in the extended sense of "of little importance," 1974, from marginalize + noun ending -ation.

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Definitions of marginalization

marginalization (n.)
the social process of becoming or being made marginal (especially as a group within the larger society);
the marginalization of the underclass
the marginalization of literature
Synonyms: marginalisation
From wordnet.princeton.edu