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requirement (n.)

1520s, "request, requisition" (a sense now obsolete), from require + -ment. Meaning "things required, a need, something necessary" is from 1660s. Meaning "that which must be accomplished, necessary condition" is by 1841. Related: Requirements. Fowler points out that requirement "means properly a need" and requisite "a needed thing," though the distinction is a fine one.

That which is required by the nature of the case, or is only indirectly thought of as required by a person, is called a requisite ; that which is viewed as required directly by a person or persons is called a requirement ...; a requisite is more often material than a requirement ; a requisite may be a possession or something that may be viewed as a possession, but a requirement is a thing to be done or learned. [Century Dictionary, 1895]

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Definitions of requirement from WordNet

requirement (n.)
required activity;
the requirements of his work affected his health
Synonyms: demand
requirement (n.)
anything indispensable;
allow farmers to buy their requirements under favorable conditions
requirement (n.)
something that is required in advance;
Synonyms: prerequisite
From wordnet.princeton.edu