Integration, in mathematics, a fundamental concept of calculus—the operation of calculating the area between the curve of a function on the x-axis or y-axis
Indefinite integration, in calculus, the process of calculating antiderivatives—the opposites of derivatives (a.k.a. "antidifferentiation")
Symbolic integration, the computation, mostly on computers, of antiderivatives and integrals in term of formulas
In numerical analysis and in signal processing, a time series can be "integrated" numerically by various step-by-step means, including autoregressive integrated moving average and the Runge-Kutta methods
Integrated circuit, an electronic circuit whose components are manufactured in one flat piece of semiconductor material
Systems integration, the engineering practices and procedures for assembling large and complicated systems from less-complicated units, especially subsystems
DNA integration performed by a specific class of recombinase enzymes ("integrases"). Recognition of a target sequence triggers site-specific integration of ("crossover" with) a compatible "donor sequence"