НЕОБХОДИМО

в знач. сказ. (+ инф.) it is necessary/essential (+ to inf) , one must (+ to inf) ~ость ж. necessity, need; по ~ости from necessity, out of necessity; по мере ~ости as required; ~ый 1. (очень нужный) necessary, essential; that one needs после сущ. 2. (неизбежный) necessary, inevitable