Definitions of consumer on the Web:

• a person who uses goods or services
  wordnetweb.princeton.edu/perl/webwn

• Consumer is a broad label that refers to any individuals or households that use goods and services generated within the economy. The concept of a consumer is used in different contexts, so that the usage and significance of the term may vary.
  en.wikipedia.org/wiki/Consumer

• A heterotroph (chemoorganotrophy: Greek ἕτερος heteros = another and τροφή trophe = nutrition) is an organism that uses organic ...
  en.wikipedia.org/wiki/Consumer_(biology)

• someone who trades money for goods as an individual; an organism that uses other organisms for food in order to gain energy
  en.wiktionary.org/wiki/consumer

• Consumers - The Sheppard Line is the newest subway line in Toronto, Ontario, Canada, operated by the Toronto Transit Commission. ...
  en.wikipedia.org/wiki/Consumers_(TTC)

• Consumerization - Consumerization[1] is a stable neologism that describes the trend for technology companies to bring new technology to the consumer market ahead of ...
  en.wikipedia.org/wiki/Consumerization

• an individual who engages in commercial activity for personal, family or household purposes.
  www.cmcweb.ca/eic/site/cmc-cmc.nsf/eng/fe00065e.html

• An organism that feeds on other living organisms, for example animals and parasitic plants would be considered consumers. In a food chain, herbivores that eat green plants are primary consumers and carnivores that eat herbivores are secondary consumers.
  www.abheritage.ca/abnature/glossary.htm

• A person who buys or purchases items.
  www.deq.virginia.gov/kids/library/wstmanvo.html

• In mental health care, an individual who is using one or more mental health services.
  www.debebel.com/Glossary.html

• any organism that eats producers, or other consumers, as food.
  cghs.dade.k12.fl.us/shs/Ecosearch/glossary.html

• consumers - an organism requiring complex organic compounds for food which it obtains by preying on other organisms or by eating particles of organic matter Invertebrates: an organism requiring complex organic compounds for food which it obtains by preying on other organisms or by eating particles of ...
  www.whitnall.com/faculty/vstone/newsfile10049_1.doc

• A private individual at whom advertisements are aimed; a buyer.
  www.motto.com/glossary.html

• The ultimate user of a product or service.
  www.esomar.org/index.php/glossary-c.html

• An individual who buys goods for personal use and not for manufacture or resale.
  www.wdfi.org/ymm/kids/glossary/default.asp