What do you mean by marginalization?

Marginalization comprises those processes by which individuals and groups are ignored or relegated to the sidelines of political debate

The definition of marginalization is the process of making a group or class of people less important or relegated to a secondary position.

the chair is the committee member from the majority party who has the most seniority. in the south carolina senate, the chair is the committee member from the majority party who has the most committee seniority.