well-established

• well established

From well +‎ established.

well-established (comparative more well-established, superlative most well-established)

1. Having been established for a long period of time.

   Synonym: long-established

   The school has a number of well-established traditions.

   This company is probably the most well-established in the industry.

   • 1967, James R. Townsend, “The Development of CCP Doctrine, 1921–1945”, in Political Participation in Communist China‎^[1], Berkeley, Cali.: University of California Press, published 1969, →LCCN, →OCLC, page 58:

     The Shen-Kan-Ning Border Region will serve as an example of political practice during the war years. This Border Region, with a population of about one and a half million people in the three provinces (Shensi, Kansu, and Ninghsia), was by no means a typical example of the liberated areas. As the original Northwest base of the CCP and the area in which the Party Center was located, it was actually a "model" area of CCP control. However, precisely because of its well-established Party presence and its relative security from Japanese attack, the Shen-Kan-Ning Border Region set the pattern of government for all of the liberated areas.

   • 2018 October 26, Chris Fitch, “Reintroduction of military conscription in Morocco”, in Geographical‎^[2], archived from the original on 27 February 2021:

     ‘There’s been a continuation of what was a well-established pattern of protests,’ [Jonathan Hill] explains.

2. Well-known.

   It is well established that this methodology is problematic.