establishedfeature

2. A familiar and permanent part of a place or thing.

The old clock tower is an established feature of the school.

3. Something that people expect to see because it has always been there.

The annual fair is an established feature of summer in our village.

4. A well-known and accepted part of a system or group.

Weekly team meetings are an established feature of the company.

5. A natural or built part of a landscape that has existed for a long time.

The river is an established feature of the valley.