Definition: Nat. Sci. is a synonym for Natural Sciences, which includes all sciences related to living organisms. The definition of 'Nat. Sci.' encompasses the study of the natural world, including Earth's physical properties (such as temperature, pressure, density, etc.), human-made systems (like buildings and vehicles), and processes that govern them (like weather patterns, climate change, etc.). It also includes biological sciences like genetics, molecular biology, cell biology, microbiology, and genomics. The word 'Nat. Sci.' is often used to denote scientific disciplines, particularly in fields such as natural science or engineering, where it refers specifically to the study of nature. For example, in an academic context, 'Nat. Sci.' might be used by a professor teaching about biology or geology for example.