ESTABLISHMENT

The act of forming or establishing something

Example: "The constitution of a pta group last year"

An organization founded and united for a specific purpose

The persons (or committees or departments etc.) who make up a body for the purpose of administering something

Example: "He claims that the present administration is corrupt"

A public or private structure (business or governmental or educational) including buildings and equipment for business or residence

Any large organization

(ecology) the process by which a plant or animal becomes established in a new habitat

The cognitive process of establishing a valid proof