Suppose we say that all learning is "progression." This implies that there is a goal, or a destination (i.e. we progress toward some end). Is building muscle learning? Is developing coordination learning? Is adding neural synapsis learning? How about this: Learning is a relatively permanent change in the learner that makes the learner capable of doing something beyond, or outside of the bounds of, what they were previously capable of.
A conceptual framework of learning on which domain-specific, individualized, theories of learning can be constructed.