(historical) Imperial and royal, with reference to the Habsburg monarchy, especially as rulers of Austria-Hungary.

The eleventh letter of the English alphabet, called kay and written in the Latin script.

The ordinal number eleventh, derived from this letter of the English alphabet, called kay and written in the Latin script.

(computing) A kilobyte (more formally KB or kB). / (computing) A kilobit (more formally kb), especially in measuring Internet connection. / (colloquial) kilometre or kilometres.

(colloquial, text messaging, Internet slang) OK

The eleventh letter of the English alphabet, called kay and written in the Latin script.

The ordinal number eleventh, derived from this letter of the English alphabet, called kay and written in the Latin script.

(law, informal) Abbreviation of contract. / (education, US) Abbreviation of kindergarten. / (often computing) Abbreviation of kilo-, 1,024.

(colloquial, text messaging, Internet slang) OK

Initialism of also known as; having the specified alias.