long-standing

UK: ˌlɒŋˈstændɪŋ | US: ˌlɔːŋˈstændɪŋ

Definition
  1. adj. existing or continuing for a long time

  2. adj. having a long history or tradition

Structure
long <extended in time>stand <remain upright/endure>ing <adjective suffix>
Etymology

The word combines "long," from Old English lang (extended in duration), and "standing," from Old English standan (to remain upright or endure). The suffix "-ing" transforms the verb "stand" into a participial adjective, creating a compound meaning "enduring for a long time." The logic reflects physical endurance metaphorically extended to temporal persistence.

Examples
  1. The two companies have a long-standing partnership.

  2. Their long-standing feud finally ended last year.

  3. This tradition is a long-standing part of our culture.

  4. She addressed the long-standing issue in her speech.

  5. The treaty resolved a long-standing dispute between the nations.