incidental - definition and synonyms

adjective 

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/ˌɪnsɪˈdent(ə)l/
  1. 1
    related to something but considered less important

    an incidental observation

    incidental expenses (=small costs connected with an activity):

    You will receive an allowance for meals and incidental expenses.

    incidental to:

    Information skills are not merely incidental to the curriculum but central to it.