Adjective
long-established (comparative more long-established or longer-established, superlative most long-established or longest-established)
That has been in existence for a long time.
Synonym: well-established
Advantages include relative effectiveness, ease of implementation, long-established legal precedent, and familiarity. Source: Internet
A short distance from Shibuya, one of the capital’s long-established landmarks is slated for removal: Harajuku’s iconic wooden train station. Source: Internet
He died three hours later. citation The massacre was allegedly planned by the organization led by Al Capone to eliminate George "Bugs" Moran, the boss of the long-established North Side Gang. Source: Internet
Anitta was succeeded by Zuzzu (r. 1720–10); but sometime in 1710–05, Kanesh was destroyed taking the long-established Assyrian merchant trading system with it. Source: Internet
Art in Ecology is a long-established art-in-the-workplace venue that features works by numerous northwest artists. Source: Internet
Despite the development over recent decades of the ability through radiocarbon dating and other scientific methods to give actual dates for many sites or artefacts, these long-established schemes seem likely to remain in use. Source: Internet