Definition of sixth sense noun from the Oxford Advanced Learner's Dictionary

 

sixth sense

 noun
noun
BrE
 
; NAmE
 
[singular]
 
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a special ability to know something without using any of the five senses that include sight, touch, etc. My sixth sense told me to stay here and wait. Often our intuition or sixth sense warns us of impending danger. Parents tend to develop a sixth sense that means they know when their children are really sick. Some kind of sixth sense warned me not to stay there.
See the Oxford Advanced American Dictionary entry: sixth sense