established

To make stable or firm; to confirm.

To form; to found; to institute; to set up in business.

To appoint or adopt, as officers, laws, regulations, guidelines, etc.; to enact; to ordain.

Having been in existence for a long time and therefore recognized and generally accepted.

Of a religion, church etc.: formally recognized by a state as being official within that area.

(Model, procedure, disease) Explicitly defined, described or recognized as a reference.