◙ ordinal number 1. constituting number five in a sequence;5th • 第五 »the fifth century bc. 公元前5世纪。 »her mother had just given birth to another child, her fifth. 她妈妈刚又生了一个孩子，她的第五个孩子。 »the world's fifth-largest oil exporter. 世界第五大石油出口商。 »the fifth of November. 11月5号。 (a fifth/one fifth)each of five equal parts into which something is or may be divided • 五分之一 the fifth finisher or position in a race or competition • （比赛或竞赛的）第五名；第五位 »he finished fifth. 他得了第五名。 (in some vehicles) the fifth (and typically highest) in a sequence of gears • （某些车辆的）第五挡（多为最高挡） »in my panic I changed from third to fifth. 慌乱之中，我从第三档换到了第五档。 (chiefly Brit.)the fifth form of a school or college • [主英] （学校、学院的）第五学年；五年级 fifthly (used to introduce a fifth point or reason) • 第五（用来引出第五个要点或原因） »fourth, it can aid the process of life review, and fifth, it is an enjoyable and stimulating experience. 第四，它有助于反思生活，第五，这种经历让人感到愉悦、刺激。 [Music] an interval spanning five consecutive notes in a diatonic scale, in particular also perfect fifth an interval of three tones and a semitone (e.g. C to G) • [乐] 五度音程 »strings tuned a fifth apart. 调为五度音程的弦乐器。 [Music] the note which is higher by such an interval than the root of a diatonic scale • [乐] 五度音 (a fifth of)[US informal] a fifth of a gallon, as a measure of alcoholic liquor, or a bottle of this capacity • [美，非正式] （酒量单位）五分之一加仑；容量为五分之一加仑的酒瓶 » a fifth of whisky. 1/5加仑的威士忌。
【IDIOMS】
◘ take the fifth 1. (in the US) exercise the right guaranteed by the Fifth Amendment to the Constitution of refusing to answer questions in order to avoid incriminating oneself • （美国）（根据《宪法第五修正案》）拒绝回答问题（以免受牵连）