Wikipedia:

Organism

Summary:

any contiguous living system. In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole. An organism may either be unicellular or be composed of, ...  (39 of 3991 words, 6 images)

Link:

http://en.wikipedia.org/wiki/Organism  [cite]

Random House:

organism

Summary:

a form of life composed of mutually interdependent parts that maintain various vital processes. | a form of life considered as an entity; an animal, ...  (24 of 95 words, 4 senses, pronunciation)

Link:

http://dictionary.infoplease.com/organism  [cite]

Merriam-Webster:

organism | organismic | organismal | organismically

Summary:

a complex structure of interdependent and subordinate elements whose relations and properties are largely determined by their function in the whole | ...  (21 of 67 words, 2 senses, pronunciation)

Link:

http://www.merriam-webster.com/dictionary/organism  [cite]

Encarta:

organism | organisms [plural] | organismal [adjective] | organismic [adjective] | organismically [adverb]

Summary:

a living thing, e.g. a plant, animal, virus, or bacterium | a functioning system of interdependent parts that resembles a living thing  (21 of 57 words, 2 senses, pronunciation)

Link:

http://encarta.msn.com/dictionary 1861684835/definition.html  [cite]

Wiktionary:

organism | organisms [plural] | free-living organism | organismal | organismic

Summary:

[biology] A discrete and complete living thing, such as animal, plant, fungus or microorganism. | [by extension] Any complex thing with properties normally associated with living things.  (26 of 35 words, 2 senses, pronunciation)

Link:

http://en.wiktionary.org/wiki/organism  [cite]

Britannica:

be

Summary:

any of the hereditary occupational groups in early Japan, established to provide specific economic services and a continuous inflow of revenue for the ...  (23 of 104 words)

Link:

http://www.britannica.com/EBchecked/topic/57075/be  [cite]