incidental

nouns

(frequently plural) an expense not budgeted or not specified
"he requested reimbursement of $7 for incidental expenses"
incidental, incidental expense, minor expense
an item that is incidental
incidental
is a type of (narrower)
a distinct part that can be specified separately in a group of things that could be enumerated on a list
"he noticed an item in the New York Times"; "she had several items on her shopping list"; "the main point on the agenda was taken up first"
item, point

adjectives

(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
"incidental expenses"; "the road will bring other incidental advantages"; "extra duties incidental to the job"; "labor problems incidental to a rapid expansion"; "confusion incidental to a quick change"
incident, incidental
antonym
basic
not of prime or central importance
"nonessential to the integral meanings of poetry"- Pubs.MLA
incidental, nonessential
following or accompanying as a consequence
"an excessive growth of bureaucracy, with attendant problems"; "snags incidental to the changeover in management"; "attendant circumstances"; "the period of tension and consequent need for military preparedness"; "the ensuant response to his appeal"; "the resultant savings were considerable"
accompanying, attendant, concomitant, consequent, ensuant, incidental, resultant, sequent