a course of instruction provided by a correspondence school.
Origin of correspondence course
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for correspondence course
Historical Examples of correspondence course
"I fear your correspondence-course has been neglecting Art," she murmured.
It's as good as a correspondence-course in literature to hear those two go on.