An ally is any person who supports, advocates, or defends another person or group of persons from under-represented or marginalized groups to remove external barriers that prevent them from bringing their skills and talents to the workplace or community.
An ally is a member of a group with privileges that takes steps to support people outside their own group and/or facilitate access to opportunities for less privileged people.
Being an ally is an active verb and an ongoing process of building relationships based on trust, consistency, and responsibility with individuals and/or groups of under-represented or marginalized people.