indispensability

/ˌɪndɪˌspɛnsəˈbɪləti/
noun
  1. The quality of being absolutely necessary or essential.
    • Modern society often overlooks the indispensability of bees for pollination.
    • Her indispensability to the team was proven when they lost every game after she left.
    • The indispensability of clean water became clear during the drought.