ma·tu·ti·nal /ˌmæʧʊˈtaɪnḷ; məˈtutnəl, ˈtjut, ˈtutṇəl, ˈtju-/
  (a.)早晨的,黎明的,早的
  Mat·u·ti·nal a.  Of or pertaining to the morning; early.
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  matutinal
       adj : pertaining to or occurring in the morning; "took his
             matutinal walk"