The phrase "critical milestone" refers to an important point or event that marks a significant achievement or progress in a particular task or project. Full definition
This plan pays out money at critical milestones of your child such as child's higher education, his marriage, starting a business, etc.. (comparepolicy.com)
This new product is for those parents who wants to make their child's future secure during critical milestones like marriage, education, etc.. (policybazaar.com)
Prepare for the long haul, as your accountant will become a part of your business's most critical milestones. (pnc.com)