Definition of Q noun from the Oxford Advanced American Dictionary

 

Q

 noun
noun
NAmE//kyu//
 
q[countable, uncountable](pl. Qs, Q's, q's
NAmE//kyuz//
 
)
 
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the 17th letter of the English alphabet “Queen” begins with (a) Q/“Q.”
Idioms
mind your Ps and Qs(informal)
 
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to behave in the most polite way you can
See the Oxford Advanced Learner's Dictionary entry: Q