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: needy, impoverished
: urgent, pressing
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all-important, critical, essential, imperative, indispensable, integral, must-have, necessary, needed, needful, required, requisite, vital
dispensable, inessential, needless, nonessential, unessential, unnecessary, unneeded
1611, in the meaning defined at sense 1
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necessity is the mother of invention
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occurring twice a year or every two years
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