#1 incidental n. [incidental expense, minor expense] (frequently plural) an expense not budgeted or not specified; "he requested reimbursement of $7 for incidental expenses". wn
#2 incidental n. an item that is incidental. wn
#3 incidental s. [nonessential] not of prime or central importance; "nonessential to the integral meanings of poetry"- Pubs.MLA. wn
#4 incidental s. [attendant, consequent, accompanying, concomitant, ensuant, resultant, sequent] 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". wn
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