What does “powerful” mean, when discussing programming languages?

Question

In the context of programming language discussion/comparison, what does the term \"power\" mean?

Does it have a well defined meaning? Even a poorly defined meaning?

Answer 1

I think that power would normally refer to how quickly it can process data, for example I found that in python as soon as a list exceeds a length of approx. 2000 it becomes unbearably slow whereas in C++ a list can easily contain 20,000 entries without doing so.