established

verb:set up (something) on a firm or permanent basis; create
- The company was established in 1995.
verb:to achieve permanent acceptance or recognition for
- She quickly established herself as a leading expert in the field.
verb:to show (something) to be true or certain by determining the facts
- The audit established that there had been no fraud.
adjective:having been in existence for a long time and therefore recognized and generally accepted
- He followed the established procedure for reporting the incident.