IPA: //ˈkɔːrpəˌreɪtər//
KK: /ˈkɔːrpəˌreɪtər/
A person who is a member or part of a corporation, often involved in its organization or management.
As a corporator, she had a say in the decisions made by the company.
Corporator → It is formed from "corpus" (meaning body) and "-ator" (meaning one who). The word "corporator" refers to one who is part of a body or organization, particularly in a legal or corporate sense.
Think of someone who is part of a 'body' ('corpus') — that's why a corporator is someone who belongs to a corporate body.