Do you mean AP is the choice of losing consistency given a partition?
I'm leaving my original reply below because what the hell.
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Yes, exactly.
Think of it this way: you don't actually have any control over partitioning, therefore partitions are a given. So CAP is expressed as such: given a partition, choose between consistency and availability.
EDIT: I personally find PACELC [0] less confusing, and more nuanced than CAP, but they basically say the same thing.