C, c
noun uk/siː/ us/siː/ Cs, C's or c's
(LETTER)
[ C or U ]（英语字母表的第三个字母）
the third letter of the English alphabet
(MUSIC)
[ C or U ]C 音
a note in Western music
This song is in (the key of) C. 这首歌是C调的。
(MARK)
[ C or U ]（学业成绩的）C 等，第三等，丙等，中等
a mark in an exam or for a piece of work that shows that your work is average
Rachel got (a) C for her French exam. 雷切尔在她的法语考试中得了个 C。
(NUMBER)
[ C ] (also c)（罗马数字）100
the sign used in the Roman system for the number 100
(TEMPERATURE)
[ after noun ]摄氏温度（Celsius的缩写）
abbreviation for Celsius
The temperature today reached 25°C. 今天的气温达到了25摄氏度。
(COMPUTER LANGUAGE)
（计算机）C 语言
a computer programming language