2006 New York Code - Definition.

 
    §  20-404  Definition.  a. A process server is a person engaged in the
  business of serving or one who purports  to  serve  or  one  who  serves
  personally  or  by  substituted  service  upon  any person, corporation,
  governmental or political subdivision or agency,  a  summons,  subpoena,
  notice,  citation  or other process, directing an appearance or response
  to a legal action, legal proceeding or administrative proceedings.
    b. For the purposes of this subchapter the service  of  five  or  more
  process  in any one year shall be deemed to constitute doing business as
  a process server.