1st_ In Spanish it is used as an exclamation, typically "Ca!"" , which is interpreted as doubt, surprise, denial. Reduction of what. 2nd_ 'CA' stands for 'alternating current'. 3rd_ 'Ca' is the chemical symbol of calcium. 4th_ 'ca' is the symbol of the centiarea . 5th_ 'ca' is Canada's domain on the Internet. See ca . .
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