The phrase "urgent necessity" means something that needs to be done or obtained immediately because it is extremely important and cannot be postponed. Full definition
Among the several positions on the pitch where Arsenal need reinforcements, the most urgent necessity at the moment is at defensive midfield. (justarsenal.com)
When disaster strikes, AmeriCares provides urgent necessities like medicine and humanitarian aid. (MomLifeTV.com)
But guidelines agreed by the Ecofin meeting of European Union finance ministers on November 14 2008 were clear: «These negotiating discussions shall be conducted in a compatible and co-ordinated manner and account will be taken of the difficult and unprecedented circumstances in which Iceland finds itself and the urgent necessity of deciding on measures which will enable Iceland to restore its financial and economic system.» (michael-hudson.com)