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  1. logical necessity

    • IPA[ˈläjəkəl nəˈsesədē]
    • n.
      that state of things which obliges something to be as it is because no alternative is logically possible.;a thing which logically must be so.
    • noun: logical necessity, plural noun: logical necessities

    • 更多解釋
    • n.
      that state of things which obliges something to be as it is because no alternative is logically ...

    Oxford Dictionary