The phrase "significant revisions" means making important changes or alterations to something. It refers to making substantial and meaningful adjustments to improve or update a particular thing. Full definition
Note that this protocol may undergo significant revision before it is finalized. (climateactionreserve.org)
One of the most significant revisions limits what out - of - school suspensions can be used for and expands expectations that teachers and other school staff deal with a greater range of behavior. (engagingschools.org)
Have each employee sign a similar receipt each time significant revisions or updates of the handbook are distributed. (petbusiness.com)