1. (

• requirement ,
• demand

) required activity; "the requirements of his work affected his health"; "there were many demands on his time" ;

2. (

• necessity ,
• essential ,
• requirement ,
• requisite ,
• necessary

) anything indispensable; "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" ;

3. (

• prerequisite ,
• requirement

) something that is required in advance; "Latin was a prerequisite for admission" ;