(noun.) an item that is incidental.
(adj.) not of prime or central importance; 'nonessential to the integral meanings of poetry'- Pubs.MLA .
(adj.) (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' .
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杰克逊整理