third
/θɜːd/ordinal number
1- constituting number three in a sequence; 3rd第三：
the third century
3世纪
the third of October
10月3日
Edward the Third.
爱德华三世。
1.1
a third/one third
each of three equal parts into which something is or may be divided三分之一：a third of a mile.
1/3英里。
1.2
- the third finisher or position in a race or competition（比赛或竞赛的）第三名; 第三位：
Hill finished third.
希尔在比赛中得了第三名。
1.3
- the third in a sequence of a vehicle's gears（机动车变速器的）第三挡：
he took the corner in third.
拐弯时他换到第三挡。
1.4
- Baseball third base【棒球】第三垒。
1.5
- chiefly Brit. the third form of a school or college〈主英〉三年级。
1.6
- thirdly (used to introduce a third point or reason)第三（用来引出第三个要点或原因）：
second, they are lightly regulated; and third, they do business with non-resident clients.
第二, 他们没有受到严格管理; 第三, 他们和没有固定地点的客人做生意。
1.7
- Music an interval spanning three consecutive notes in a diatonic scale, e.g. C to E (major third, equal to two tones) or A to C (minor third, equal to a tone and a semitone)【乐】三度音程。
1.8
- Music the note which is higher by this interval than the tonic of a diatonic scale or root of a chord【乐】三度音。
1.9
- Brit. a place in the third grade in an examination, especially that for a degree〈英〉（尤指学位考试中的）第三等, 丙级。
短语
third time lucky（或〈美〉third time is the charm）
- used to express the hope that, after twice failing to accomplish something, one may succeed in the third attempt第三次会成功; 事不过三。
词源
Old English thridda, of Germanic origin; related to Dutch derde and German dritte, also to THREE. The spelling thrid was dominant until the 16th cent. （but thirdda is recorded in Northumbrian dialect as early as the 10th cent.）.