Distance Learning

I am currently taking an online course about the history of distance learning. This week I read an article about distance learning which was written by Doug Valentin from the University of Oklahoma. In the artcle he lists the following definitions of distance learning:

". . . the term distance learning has been applied to many instructional methods: however, its primary distinction is that the teacher and the learner are separate in space and possibly time." Teaster and Blieszner (1999)
". . . distance education and training result from the technological separation of teacher and learner which frees the student from the necessity of traveling to a fixed place, at a fixed time, to meet a fixed person, in order to be trained." Keegan (1995)