What is the meaning of incidental?

noun

• Frequently plural. ( an expense not budgeted or not specified)
  • usage: "he requested reimbursement of $7 for incidental expenses"
  • synonyms: incidental expense, minor expense
• An item that is incidental.

adjective

• Sometimes followed by `to'. ( minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence)
  • usage: "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"
  • synonyms: incident
• Not of prime or central importance."nonessential to the integral meanings of poetry- Pubs. MLA
  • synonyms: nonessential
• Following or accompanying as a consequence.
  • usage: "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"
  • synonyms: attendant, consequent, accompanying, concomitant, ensuant, resultant, sequent