Definition of deep noun from the Oxford Advanced Learner's Dictionary

     

    deep

     noun
    noun
    BrE BrE//diːp//
     
    ; NAmE NAmE//diːp//
     
     
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  1. 1the deep [singular] (literary) the sea His body was committed to the deep (= he was buried at sea).
  2. 2the deep [singular], the deeps [plural] a deep part of something; the deepest part of something in the deep of night/winter (= in the middle of the night/of winter) (figurative) the deeps of sorrow the deeps of Loch Ness
  3. Word Familydeep adjective adverbdeeply adverbdeepen verbdepth noun Word Origin Old English dēop (adjective), dīope, dēope (adverb), of Germanic origin; related to Dutch diep and German tief, also to dip.
See the Oxford Advanced American Dictionary entry: deep