A quick definition of Instructional Design

“What is Instructional design? In short, instructional design is the systematic process by which instructional materials are designed, developed, and delivered. The terms instructional design, instructional technology, learning experience (LX) design, educational technology, curriculum design, and instructional systems design (ISD), are often used interchangeably (Instructional Design Central 2017).”
The University of Michigan has a couple of definitions in different contexts: “Definitions of Instructional Design – University of Michigan” http://www.umich.edu/~ed626/define.html
Instructional Design Central (2017) Instructional Design Central, LLC Retrieved from: https://www.instructionaldesigncentral.com/whatisinstructionaldesign