n the act of forming or establishing something
it was the establishment of his reputation
n an organization founded and united for a specific purpose
n the persons (or committees or departments etc.) who make up a body for the purpose of administering something
he quickly became recognized as a member of the establishment
n a public or private structure (business or governmental or educational) including buildings and equipment for business or residence
n any large organization
n (ecology) the process by which a plant or animal becomes established in a new habitat
n the cognitive process of establishing a valid proof