A can is a metal container, usually cylindrical in shape, which has an airtight seal when it's new. All kinds of goods come in cans, from fruit and vegetables to paint and oil. Can is usually used in standard spoken English when asking for permission. It is acceptable in most forms of written English, although in very formal writing, such as official instructions, may is often used instead: Persons under 14 unaccompanied by an adult may not enter. CAN definition: to be able to; have the ability, power, or skill to. See examples of can used in a sentence. Define can. can synonyms, can pronunciation, can translation, English dictionary definition of can. to be able to, have the power or skill to: I can take a bus to the airport. Canva is a free-to-use online graphic design tool. Use it to create social media posts, presentations, posters, videos, logos and more. (countable) A can is a metal container, usually for holding food or drink. I drink cola from a can. Spaghetti hoops come in a can. Do you use “can” and “could” correctly in English? Join me and learn how to use these two important modal verbs, in terms of grammar, vocabulary, and pronunciation. This disambiguation page lists articles associated with the title Can. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. The use of can to ask or grant permission has been common since the 19th century and is well established, although some feel may is more appropriate in formal contexts. May is relatively rare in negative constructions (mayn't is not common); cannot and can't are usual in such contexts. The present tense negative can not is usually contracted to cannot (more formal) or can’t (less formal). The use of can in asking permission is sometimes criticized as being impolite or incorrect by those who favour the more formal alternative “may I.?”.