=> C

abbr 缩写 =
1 cent(s).
2 century(1b)
*in the 19th c 在19世纪
* a c19 church 19世纪的教堂. Cf 参看 cent abbr 缩写.
3 (also ca) (esp before dates 尤用于年代之前) about; approximately (Latin circa) 约, 大约（源自拉丁文circa）
*c1890 约1890年.

c
alsoc.
alsoC
the written abbreviation of century
　the economic changes of the C20th
a written abbreviation of circa (=about) , used especially before dates
　c. 1830
©
the written abbreviation of copyright
AmE the written abbreviation of cup , used in cooking