Definition of wishful thinking noun from the Oxford Advanced Learner's Dictionary

 

wishful thinking

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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the belief that something that you want to happen is happening or will happen, although this is actually not true or very unlikely I've got a feeling that Alex likes me, but that might just be wishful thinking.
See the Oxford Advanced American Dictionary entry: wishful thinking