incidental /ˌinsiˈdentl/ adj. 1.伴随的，易发生的：incidental to the main issue 附属于主要问题的；the dangers incidental to a soldier’s career 军人生涯中容易发生的危险 2.偶然的： incidental expenses 临时费用；incidental acquaintance 萍水相逢

 incidentally /ˌinsiˈdentəli/ adv. 顺便说及地，顺便提一句(= by the way): Incidentally, she found the book you asked for. 顺便告诉你，她找到了你要的书。