/ˈəʊvətʃʊə(r);-tjʊə(r)||; ˈovɚˌtʃυr/noun1 [C] a piece of music that is the introduction to a musical play (such as an opera or a ballet) （歌剧、芭蕾舞等的）序曲，前奏曲
2 [C] [usu.pl] (formal 正式) an act of being friendly towards sb, especially because you want to be friends, to start a business relationship, etc 表示友好的行动（尤指为了交朋友、建立业务关系等）