postmeridian

from WordNet (r) 3.0 (2006)
postmeridian
    adj 1: after noon [ant: {antemeridian}]
    
from The Collaborative International Dictionary of English v.0.48
Postmeridian \Post`me*rid"i*an\, a. [L. postmeridianus; post
   after + meridianus. See {Meridian}.]
   1. Coming after the sun has passed the meridian; being in, or
      belonging to, the afternoon. (Abbrev. P. M.)
      [1913 Webster]

   2. Fig., belonging to the after portion of life; late. [R.]
      [1913 Webster]
    

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