1. demand, requirement

required activity

Example Sentences:
'the requirements of his work affected his health'
'there were many demands on his time'

Synonyms

• demand

2. essential, necessary, necessity, requirement, requisite

anything indispensable

Example Sentences:
'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'

Synonyms

• essential
• necessary
• necessity
• requisite

3. prerequisite, requirement

something that is required in advance

Example Sentences:
'Latin was a prerequisite for admission'

Synonyms

• prerequisite