postmeridian
  (a.)午後的,午後發生的
  Post·me·rid·i·an a.
  1. Coming after the sun has passed the meridian; being in, or belonging to, the afternoon. (Abbrev. P. M.)
  2. Fig., belonging to the after portion of life; late. [R.]
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  postmeridian
       adj : after noon [ant: antemeridian]