A person who institutes something

plural of instituter

In a way that conforms to an institution.

Tending or intended to institute; having the power to establish. / Established; depending on, or characterized by, institution or order.

An educational institution, dedicated to teaching and/or research. / An educational institution, dedicated to higher education and research, that grants academic degrees.

(business) Pertaining to business-to-business activities of commercial organizations serving institutions such as schools, organizations, and churches with products and/or services.

(derogatory slang) A psychiatric hospital, or the psychiatric ward of a hospital.

The systems of formal laws, regulations, and procedures, and informal conventions, customs, and norms, that shape socioeconomic activity and behaviour.

plural of mental institution

(US, formal, euphemistic) A prison.