incidental

英 [ɪnsɪ'dent(ə)l] 美['ɪnsə'dɛntl]

• adj. 附带的；偶然的；容易发生的
• n. 附带事件；偶然事件；杂项

1. (frequently plural) an expense not budgeted or not specified;

"he requested reimbursement of $7 for incidental expenses"

2. an item that is incidental