exigency - definition and synonyms

noun [countable] [usually plural] formal 

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/ˈeksɪdʒ(ə)nsi/

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/ɪɡˈzɪdʒ(ə)nsi/
singularexigency
pluralexigencies

or exigence 

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/ˈeksɪdʒ(ə)ns/

  1. something difficult that you must deal with as part of a situation or job