@ catkin : My understanding : a costumer is a person or
a company, who buys something ( from a vendor, etc.)
1) A modern dictionary : costumer ..
http://www.english-test.net/toeic/vo...efinitions.php
> client; buyer; person who buys a product or service
2) Webster 1972: costum´er: makes, sells, rents costumes.(Theatre).
3) The 'Oxford Advanced... 1994' : No word = "costumer".
But : costumier : makes, sells, rents costumes.(Theatre).
.....
4) .. word costumer origin ..
http://www.wisegeek.com/what-is-the-...d-a-client.htm
"".. the origin of the word "customer" dates back to the
Middle English of the 1400s and is related to the word
"customs" as ways of doing things.""
.....
EDIT ..
P.S. : Sorry for the typos costumer / customer.
.....