incidental
US /ˌɪn.sɪˈden.t̬əl/
UK /ˌɪn.sɪˈden.t̬əl/

1.
incidental, acidental, secundário
happening as a minor accompaniment to something else
:
•
The discovery was incidental to their main research.
A descoberta foi incidental à sua pesquisa principal.
•
Any costs incurred will be purely incidental.
Quaisquer custos incorridos serão puramente incidentais.