"cc" stands for cubic centimeters. It is the size of the engine. Back in the day, cars went with "cubic inches". My old car, for example, was 318 cubic inches. Now with metrics, cubic centimeters is used. For computer science cc stands for carbon copy.
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In the context of volumes it satnds for cubic centimetres (or centimetres cubed).
In the context of mail it stands for carbon copy.
There are several hundred other possibilities - and without the context it is not possible to guess which one you are after.
Depending upon the context, it can mean: