Science is from the Latin word "scientia", meaning knowledge. Science is an enterprise that builds and organizes knowledge in the form of a testable explanation and predictions about the world. Since classic antiquity, science as a type of knowledge was closely linked to philosophy, the way of life dedicated to discovering such knowledge. By the 17th century, "natural philosophy" could be considered separately from philosophy, in general.
The narrower sense of science that is common today developed as a part of science became a distinct enterprise of defining "laws of nature", based on early examples such as Kepler's laws, Galileo's laws, and Newton's laws of motion. In this period, it became more common to refer to natural philosphy as "natural science".