/ˌæksɪˈdentl ||; ˌæksəˈdɛntḷ/adj happening by chance; not planned 意外的；偶然: Police do not know if the explosion was accidental or caused by a bomb.警方不知道爆炸是意外的还是由炸弹引起的。 ➔accidentally /-təli ||; -tḷɪ/ advShe accidentally took the key to the office home with her, so nobody could get in.她无意中把办公室钥匙带了回家，弄得谁也进不去。
accidental²
/ˌæksɪˈdentl ||; ˌæksəˈdɛntḷ/noun [C] (used in music 用于音乐) a sign meaning that a note in a piece of music should be made higher or lower 临时号，临时变调符号（用以升高或降低音符）