The phrase "necessary precondition" means something that must happen or be in place before another thing can occur. It is a requirement or condition that is needed beforehand.
Sentences with «necessary precondition»
The laws are necessary preconditions for science to even exist. (religion.blogs.cnn.com)
«These are necessary preconditions for legitimate and effective action. (politics.co.uk)
While technical feasibility is a necessary precondition for automation, other factors are required to build a compelling business case. (fortune.com)