incidental

US /ˌɪn.sɪˈden.t̬əl/
UK /ˌɪn.sɪˈden.t̬əl/
"incidental" picture
1.

insidental, kebetulan, tambahan

happening as a minor accompaniment to something else

:
The discovery was incidental to their main research.
Penemuan itu kebetulan terjadi pada penelitian utama mereka.
Any costs incurred will be purely incidental.
Biaya yang timbul akan murni insidental.