'Postmeridian' definitions:

Definition of 'postmeridian'

(from WordNet)
adjective
After noon [ant: antemeridian]

Definition of 'Postmeridian'

From: GCIDE
  • 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]