Main entry: prerequisite, requirement
Definition: something that is required in advance
Usage: Latin was a prerequisite for admission
Main entry: requirement, demand
Definition: required activity
Usage: the requirements of his work affected his health; there were many demands on his time
Main entry: necessary, necessity, essential, requirement, requisite
Definition: anything indispensable
Usage: food and shelter are necessities of life; the essentials of the good life; allow farmers to buy their requirements under favorable conditions; a place where the requisites of water fuel and fodder can be obtained