1. 英语字母表的第3个字母
C is the third letter of the English alphabet.
2. C大调音阶中的第一音;C音
In music, C is the first note in the scale of C major.
3. （作业、考试等）丙等，第三等，C级
If you get a C as a mark for a piece of work or in an exam, your work is average.
4. (用于日期或数字前)约,大约
c. is written in front of a date or number to indicate that it is approximate. c. is an abbreviation for (缩略 =) 'circa'.
e.g. ...the museum's recreation of a New York dining-room (c. 1825-35).
博物馆内对一家纽约餐厅(约1825-1835年)的再现
5. (用于首字母为C的一些单词的缩写,如 copyright, Celsius 等)
C or c is used as an abbreviation for words beginning with c, such as 'copyright' or 'Celsius'.
e.g. Heat the oven to 180?C.
把炉子加热到摄氏180度。
6. see also: C-in-C;c/o