The phrase "major revisions" means making significant changes or edits to something, often with the intention of improving or altering it substantially. Full definition
There will be many new fundamental discoveries made in the coming years, so this section of the web site will surely undergo major revisions of the content. (astronomynotes.com)
In each case, preparing teachers to develop and teach curricula that fully integrate these types of technology tools requires major revisions in methods courses and the uses of technology in teacher education. (citejournal.org)
The first major revision to the tax code in more than 30 years has now been signed into law. (us.beyondbullsandbears.com)