The phrase "entire unit" means the whole thing or all parts together as a single piece.
Sentences with «entire unit»
Individual lessons and projects, as well as entire units, are searchable by topic or standards and can be easily inserted into the new custom course. (odysseyware.com)
Because it comes with one blade, if it ever gets damaged you will need to replace the whole entire unit. (primandprep.com)
Could be combined with other Hindu lessons for entire unit of work or combined with Art for cross-curricular lessons. (tes.com)