long-standing

listen to the pronunciation of long-standing
English - English
Describing something that has been done for so long that it has become convention

Long-standing custom calls for referring to the town chairman as mayor, even though we don't have a mayor.

Describing something that has existed for a long time
very old, ancient, antique
A long-standing situation has existed for a long time. They are on the brink of resolving their long-standing dispute over money. long-standing economic links between Europe and much of Africa. having continued or existed for a long time
longstanding
Having persisted for an extended period of time

After many years the longstanding disagreement broke into open legal action.

a quarrel of long standing
{i} very old quarrel, long-standing dispute
longstanding
having existed for a long time; "a longstanding friendship"; "the longstanding conflict
longstanding
having existed for a long time; "a longstanding friendship"; "the longstanding conflict"
longstanding
Describing something that has persisted for an extended period of time
longstanding
{s} existing for a long time, of long duration