incidental
🇺🇸
/ˌɪnsɪˈdentl/
🇬🇧
/ˌɪnsɪˈdentl/
happening along with something else but not the main part
The extra cost was incidental to our main purchase.
happening as a natural result
The noise is incidental to living in a busy city.
a small extra thing that happens along with something else
We budgeted for travel incidentals like snacks and souvenirs.