Allyship
Allyship is a process, and everyone has more to learn. Allyship involves a lot of listening. Sometimes, people say "doing ally work" or "acting in solidarity with" to reference the fact that "ally" is not an identity, it is an ongoing and lifelong process that involves a lot of work.
Oppression
The systematic, social phenomenon of prejudice and social power that manifests on a personal, institutional, and societal/cultural level. The result is the exploitation of one social group by another for the benefit of the agent/oppressor group.
Note that people can be oppressive without intending to be so.
Source: Tri-Co Summer Institute 2013 Committee
Privilege
Having unearned benefits because of an identity you hold. There are various forms of privilege.
Positionality
Positionality is the place from which you view the world. The concept grew out of reflexive anthropology and sociology in the 1980s, and is a way of describing one’s social position in order to understand 1. power relations, 2. how one’s own subjectivity affects how one interprets and observes experiences.
Solidarity
Source: Oxford Dictionaries Online
For more definitions, see our definitions page.