名詞 incidental:

1. (frequently plural) an expense not budgeted or not specified
   同義詞：incidental expense, minor expense
2. an item that is incidental

形容詞 incidental:

1. (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
   同義詞：incident
2. following as a consequence
   同義詞：accompanying, attendant, concomitant, incidental to
3. not of prime or central importance- Pubs.MLA
   同義詞：nonessential

1. An incidental action performed by an actor on the stage to fill a pause between lines or to provide interesting detail.
   (演員的)動作演員在舞臺上為了填補(bǔ)背臺詞間的停頓和提供有趣的細(xì)節(jié)所做的附加動作
2. Fatigue is incidental to a journey in a strange land.
   在陌生的地方旅行，容易疲勞。
3. The incidental expenses of cars in this city are expensive.
   這個城市汽車的附加費(fèi)用很昂貴。
4. You should know the additional responsibilities that are incidental to the job.
   你該知道做這項(xiàng)工作要承擔(dān)額外責(zé)任。

in.ci.den.tal

adj.（形容詞）
Occurring or likely to occur as an unpredictable or minor accompaniment:
伴隨發(fā)生的：作為意想不到的或非主要的伴隨情況發(fā)生或可能發(fā)生的：
例句：
the snags incidental to a changeover in upper management.See Synonyms at accidental
在改變上層管理時產(chǎn)生的隱患參見 accidental

Of a minor, casual, or subordinate nature:
非主要的，偶發(fā)的：有非主要的、隨便的或附屬性質(zhì)的：
例句：
incidental expenses.
雜費(fèi)

n.（名詞）
A minor accompanying item or expense:
伴隨事件，雜費(fèi)：非主要的附帶項(xiàng)或費(fèi)用：
例句：
a pocket in the suitcase for incidentals.
放在衣箱中應(yīng)付臨時支出的錢包