Definition of "cannot" in English

verb

1. Can not (be unable to).

   • I cannot open the window. It is stuck.

2. Be forbidden or not permitted to

   • The Pupil after his Pupillarity, had granted a Diſcharge to one of the Co-tutors, which did extinguiſh the whole Debt of that Co-tutor, and conſequently of all the reſt, they being all correi debendi, lyable by one individual Obligation, which cannot be Diſcharged as to one, and ſtand as to all the reſt.
   • You cannot enter the hall without a ticket.

noun

1. Something that cannot be done.

   • the cans and cannots

2. A person who cannot do (something).