in·ci·den·tal /ˌɪn(t)səˈdɛntḷ/
  (a.)附帶的,偶然的,容易發生的附帶事件
  incidental
  額外時間
  incidental
  *額外
  In·ci·den·tal, n. An incident; that which is incidental; esp., in the plural, an aggregate of subordinate or incidental items not particularized; as, the expense of tuition and incidentals.
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  In·ci·den·tal a. Happening, as an occasional event, without regularity; coming without design; casual; accidental; hence, not of prime concern; subordinate; collateral; as, an incidental conversation; an incidental occurrence; incidental expenses.
     By some, religious duties . . . appear to be regarded . . . as an incidental business.   --Rogers.
  Syn: -- Accidental; casual; fortuitous; contingent; chance; collateral. See Accidental.
  -- In*ci*den*tal*ly, adv. -- In*ci*den*tal*ness, n.
     I treat either or incidentally of colors.   --Boyle.
  incidental
       adj 1: (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" [syn: incident] [ant:
              basic]
       2: following as a consequence; "an excessive growth of
          bureaucracy, with related problems"; "snags incidental to
          the changeover in management" [syn: accompanying, attendant,
           concomitant, incidental to(p)]
       3: not of prime or central importance; "nonessential to the
          integral meanings of poetry"- Pubs.MLA [syn: nonessential]
       n 1: (frequently plural) an expense not budgeted or not
            specified; "he requested reimbursement of $7 for
            incidental expenses" [syn: incidental expense, minor
            expense]
       2: an item that is incidental