In computer science, transclusion is the inclusion of part or all of an electronic document into one or more other documents by hypertext reference. Transclusion is usually performed when the referencing document is displayed, and is normally automatic and transparent to the end user. The result of transclusion is a single integrated document made of parts assembled on the fly from separate sources, possibly stored on different computers in disparate places. - wikipedia 
Transclusion. technical method of including some or all of one stored document in another document, without having to copy the data itself
- wikimedia.org 
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