1. to be unable to do something; to not have the ability, power, or permission to do something
Usage: contraction of ‘can not’; more formal than ‘can’t’

Examples

• I cannot swim very well.
• She cannot attend the meeting tomorrow.
• We cannot solve this problem without more information.
• You cannot park here without a permit.
• The door cannot be opened from the inside.
• Children cannot understand complex financial concepts.
• I cannot believe how quickly time has passed.