Answer:In science, dx commonly appears in mathematics, physics, and engineering, often representing a small change or differential in the variable x. Its meaning depends on the context:1. Calculus (Mathematics & Physics) – In differential calculus, dx represents an infinitesimally small change in the variable x. It is used in derivatives (e.g., dy/dx) and integrals (∫ f(x) dx).2. Physics & Engineering – dx is used to describe small changes in position, length, or other quantities in equations of motion, work, and energy.3. Medicine & Biology – In medical terms, Dx (capitalized) is shorthand for "diagnosis."