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English definition of “hidden”

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hidden

adjective [usually before noun] uk   /ˈhɪd.ən/ us  

hidden adjective [usually before noun] (NOT EASY TO FIND)

B1 not easy to find: a hidden valley There were hidden microphones in the room to record their conversation.

hidden adjective [usually before noun] (NOT KNOWN ABOUT)

B2 that most people do not know about: hidden costs/taxes Hidden problems may lead to an increase in costs.
(Definition of hidden from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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