Longstanding
Longstanding is an adjective used to describe something that has existed for a long time or has been established over a prolonged period. It often conveys a sense of durability, continuity, or accepted stability, and it can be applied to traditions, institutions, relationships, disputes, reputations, and other enduring features.
Form and etymology: Longstanding is typically written as a single word in contemporary English, though the
Usage notes: The phrase is frequently used to characterize things that have persisted beyond the usual span
Related terms and contrasts: Enduring, lasting, persistent, and durable describe similar ideas of longevity, while long-term
See also: long-standing; enduring tradition; persistent problem.