requirement

Necessary, inescapable, and non-negotiable, a requirement is something that must be done, like the dishes. Speaking politely to your grandparents may be a requirement of living in your parents' house.

Requirements can be imposed by an authority. For example, in college, it is usually a requirement that you study math, English, and history, before you go on to get your degree in underwater basket weaving. We can also speak of the requirements of a living system: your body requires water to stay alive; light is a requirement of photosynthesis.

Definitions of requirement
  1. noun
    required activity
    “the requirements of his work affected his health”
    synonyms: demand
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    type of:
    duty, obligation, responsibility
    the social force that binds you to the courses of action demanded by that force
  2. noun
    anything indispensable
    “allow farmers to buy their requirements under favorable conditions”
    synonyms: essential, necessary, necessity, requisite
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    Antonyms:
    inessential, nonessential
    anything that is not essential
    types:
    desideratum
    something desired as a necessity
    must
    a necessary or essential thing
    need, want
    anything that is necessary but lacking
    type of:
    thing
    a separate and self-contained entity
  3. noun
    something that is required in advance
    synonyms: prerequisite
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    types:
    show 4 types...
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    precondition
    a condition that is a prerequisite
    academic requirement
    a requirement for admission to or completion of an academic program
    essential condition, sine qua non
    a prerequisite
    language requirement
    a requirement that a student know certain languages
    type of:
    duty, obligation, responsibility
    the social force that binds you to the courses of action demanded by that force
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