longstanding
adjectiveUK /ˌlɒŋˈstændɪŋ/
US /ˌlɔːŋˈstændɪŋ/
Something longstanding has been around for a very long time.
They have a longstanding friendship that started in kindergarten.
RELATED WORDS
OTHER MEANINGS
2. Existing or continuing for a long period without change.
The company has a longstanding policy against smoking.
3. Having existed since a distant past; ancient in origin.
The longstanding tradition is celebrated every spring.
4. Firmly fixed or deeply rooted over time.
There is a longstanding belief that the lake brings good luck.