Definitions:

1. (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence adjective
   • incidental expenses
2. an expense not budgeted or not specified, frequently seen in plural form noun
   • They requested reimbursement of $7 for incidental expenses.

Synonyms:

• attendant
• incident
• incidental expense
• minor expense
• nonessential

NearBy Words:

• incidentally