Q Meaning of Q in English Q BrE AmE , q /kjuː/ ( plural Q’s , q’s ) noun [uncountable and countable] the 17th letter of the English alphabet ⇨ mind your p’s and q’s at ↑ mind 2 (23), ⇨ ↑ Q-tip Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012