Definition of thank you noun from the Oxford Advanced Learner's Dictionary

  

thank you

 noun
noun
BrE BrE//ˈθæŋk juː//
 
; NAmE NAmE//ˈθæŋk juː//
 
 
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 [usually singular] thank you (to somebody) (for something) an act, a gift, a comment, etc. intended to thank somebody for something they have done The actor sent a big thank you to all his fans for their letters of support. She took the money without so much as a thank you. a thank-you letterExtra examples He didn’t even say thank you. I would just like to say a personal thank you to all the people who contributed to this appeal. She got a special thank you for all her hard work. a big thank you to the hospital staff
See the Oxford Advanced American Dictionary entry: thank you