[1] : The Collaborative International Dictionary of English v.0.48

mail carrier \mail carrier\ n.
   a person who delivers the mail; -- also called a letter
   carrier. a male mail carrier is also called a mailman.

   syn: postman, letter carrier, carrier, mailman.
        wordnet 1.5 +pjc
see also:
letter carrier mailman 

[2] : The Collaborative International Dictionary of English v.0.48

mailman \mail"man`\ n.
   a man who delivers the mail. a male mail carrier.

   syn: postman, mail carrier, letter carrier, carrier.
        wordnet 1.5 mail-order buying
see also:
mail carrier 

[3] : WordNet (r) 2.0

mailman
     n : a man who delivers the mail syn: postman, mail carrier,
          letter carrier, carrier
see also:
postman mail carrier letter carrier carrier 

Mailman >> M Words
Mailman, definition of term: Mailman
mailman_pag1.html