Science is the enterprise that builds and organises in the form of testable explanations and predictions about the natural world.
Given their lack of magical aptitude, and general comfort at finding convenience at that which they do comprehend, Muggles are naturally inclined to science as wizards are to magic, although magic is experimented with in a scientific (or at least nearly scientific) manner.
Behind the scenes
- Magic within the Harry Potter universe is certainly treated like a science (or at least a pseudo-science). Wizards and witches conduct all sorts of experiments with their magic, and all magic schools teach a systematic approach to magic, similar to Muggle sciences. However, by both their definitions (at least in Harry Potter), magic is not a science.