Definition of logical necessity in US English:

logical necessity


  • 1That state of things which obliges something to be as it is because no alternative is logically possible.

    • ‘Nevertheless, he did not prove their logical necessity.’
    • ‘Hence, in his terms, there are physical necessity, logical necessity, mathematical necessity, and moral necessity.’
    • ‘If we regard features as components of complex entities, a taxonomy - as a matter of logical necessity - has to be acquired ‘top-down’.’
    • ‘In demanding for empirical statements the safeguard of logical necessity, these philosophers have failed to see that they would thereby rob them of their factual content.’
    • ‘First, the George Washington quote points us helpfully towards the modality of moral obligation in place of the modality of logical necessity.’
    • ‘All necessity, they hold, can in this way be reduced to logical necessity.’
    • ‘The logical necessity for carriers' liability to support a visa regime is surely self-evident.’
    1. 1.1 A thing which logically must be so.
      • ‘The internal logical necessities of atomic physics and the war led to the bomb.’
      • ‘Indeed, these justifications are widely assumed to be, in some sense, universal, because they are taken to be logical necessities.’
      • ‘We do not observe compliance to authority merely because it is a transient cultural or historical phenomenon, but because it flows from the logical necessities of social organization.’