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|Noun||1.||extension service - an educational opportunity provided by colleges and universities to people who are not enrolled as regular students|
didactics, education, educational activity, instruction, pedagogy, teaching - the activities of educating or instructing; activities that impart knowledge or skill; "he received no formal education"; "our instruction was carefully programmed"; "good classroom teaching is seldom rewarded"
extension course - a course offered as part of an extension service