名詞 ca:

1. a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
   同義詞：calcium, atomic number 20
2. a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
   同義詞：California, Golden State, Calif.

ca
abbr.（略語）
Centare.
平方米
Circa.
Circa.