Integration
There is a general consensus that integration concerns making applications work together that were never intended to work together by passing information through some form of interface.
Since the earliest days of computing, the term “integration” has been used in both the trade and academic literature to describe a process, a condition, a system, and an end-state. Given that these competing labels have very different meanings, their indiscriminate usage is often obscure and invites confusion. For example, a sloppy conflation of process and condition encourages circular definitions that possess little
explanatory power.
Thomas Gulledge What is integration? // Thomas Gulledge What is integration?, 2005 – 104 с. – 5