verb (3rd singular present can; past could /ko͝od/)
Old English cunnan 'know' (in Middle English 'know how to'), related to Dutch kunnen and German können; from an Indo-European root shared by Latin gnoscere 'know' and Greek gignōskein 'know'
Is there any difference between can and may when used to request or express permission, as in may I ask you a few questions? or can I ask you a few questions? Many people feel that can should be reserved for expressions denoting capability, as in can you swim?, rather than for those relating to permission. May is, generally speaking, a politer and more formal way of asking for something, and is the better choice in more formal contexts. See also may1 (usage).