Institutional means relating to a large organization, for example a university, bank, or church.

Institutional means relating to a building where people are looked after or held.

An institutional value or quality is considered an important and typical feature of a particular society or group, usually because it has existed for a long time.

If someone accuses an organization of institutional racism or sexism, they mean that the organization is deeply racist or sexist and has been so for a long time.