What is another word for "exigency"?

Roget's Thesaurus (1911) lists these synonyms for "exigency": able, absorbing, according, accordingly, adventitious, are, ask, attitude, attribution, being, call, cannot, case, causation, certain, charge, circumstance, circumstantial, claim, command, conditional, conditionally, conjunctive, context, contingency, contingent, create, crisis, critical, crying, death, deficiency, demand, dependence, desiderate, desideratum, desire, destitute, dispense, emergence.