1Abbrev. for initial program load. In the context of IBM mainframes, the action of loading the operating system software into a “cold” machine.
2Abbrev. for information processing language. In the early days of research into artificial intelligence the need for special-purpose languages capable of manipulating dynamic data structures was recognized. IPL-I to IPL-V were a series of list-processing languages developed to meet this need. They have long been obsolete.